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Philippe

2010-May-18 12:21 UTC

[zfs-discuss] Very serious performance degradation

Hi,

I''m running Opensolaris 2009.06, and I''m facing a serious
performance loss with ZFS ! It''s a raidz1 pool, made of 4 x 1TB SATA
disks :
        zfs_raid    ONLINE       0     0     0
          raidz1    ONLINE       0     0     0
            c7t2d0  ONLINE       0     0     0
            c7t3d0  ONLINE       0     0     0
            c7t4d0  ONLINE       0     0     0
            c7t5d0  ONLINE       0     0     0

In the beginning, when the pool was just created (and empty !), I had the
following performances :
 - Read : 200 MB/s
 - Write : 20 MB/s (10 MB/s with compression enabled)
These performances were OK at this time.

However, after 2 months of production use, and a volume of data of 1TB only, the
performances are near :
 - Read : 5 MB/s 
 - Write : 500 KB/s !!!! 
The write speed is so low that is breaks any network copy (Samba or SFTP). The
only solution I found to copy large files to the pool without outages is to use
SFTP via Filezilla, with the activation of the bandwich limit (limit=300 KB/s)
!!!

In this pool, I have 18 filesystems defined :
 - 4 FS have a recordsize of 16KB (with a total of 100 GB of data)
 - 14 FS have a recordsize of 128KB (with a total of 900GB of data)
There is a total of 284 snapshots on the pool, and compression is enabled.
There is 3 GB of physical RAM.

The usage of the pool is for daily backups, with rsync. Some big files are
updated simulteanously, in different FS. So, I suspect a huge fragmentation of
the files ! Or maybe..., a need of more RAM ??

Thank you for any thoughts !!
Philippe
-- 
This message posted from opensolaris.org

Bob Friesenhahn

2010-May-18 13:40 UTC

head link

[zfs-discuss] Very serious performance degradation

On Tue, 18 May 2010, Philippe wrote:
> The usage of the pool is for daily backups, with rsync. Some big files are
updated simulteanously, in different FS. So, I suspect a huge fragmentation of
the files ! Or maybe..., a need of more RAM ??
You forgot to tell us what brand/model of disks you are using, and the 
controller type.

It seems likely that one or more of your disks are barely working from 
time of initial installation.  Even 20 MB/s is quite slow.

Use ''iostat -x 30'' with an I/O load to see if one disk is much
slower
than the others.

Bob
-- 
Bob Friesenhahn
bfriesen at simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/

Philippe

2010-May-18 14:51 UTC

head link

[zfs-discuss] Very serious performance degradation

Hi,

The 4 disks are Western Digital ATA 1TB (one is slighlty different) :
 1 x ATA-WDC WD10EACS-00D-1A01-931.51GB
 3 x ATA-WDC WD10EARS-00Y-0A80-931.51GB

I''ve done lots of tests (speed tests + SMART reports) with each of
these 4 disk on another system (another computer, running Windows 2003 x64), and
everything was fine ! The 4 disks operate well, at 50-100 MB/s (tested with
Hdtune). And the access time : 14ms

The controller is an LSI Logic SAS 1068-IR (MPT BIOS 6.12.00.00 - 31/10/2006)

Here are some stats :

1) cp of a big file to a ZFS filesystem (128K recordsize) :
============================================================iostat -x 30
                 extended device statistics
device    r/s    w/s   kr/s   kw/s wait actv  svc_t  %w  %b
sd0       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
sd1       0.3    0.3   17.6    2.3  0.0  0.0   19.5   0   0
sd2      11.5    6.0  350.1  154.5  0.0  0.3   19.5   0   4
sd3      12.5    5.7  351.4  154.5  0.0  0.5   27.1   0   5
sd4      15.9    6.3  615.1  153.8  0.0  1.3   58.2   0   8
sd5      15.1    8.1  600.4  150.7  0.0  7.6  326.7   0  31
                 extended device statistics
device    r/s    w/s   kr/s   kw/s wait actv  svc_t  %w  %b
sd0       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
sd1      41.3    0.0 5289.7    0.0  0.0  1.3   31.0   0   4
sd2       4.2   24.1  214.0 1183.0  0.0  0.5   19.4   0   4
sd3       3.7   23.6  227.2 1183.0  0.0  2.1   78.5   0  12
sd4       6.6   26.4  374.2 1179.4  0.0 10.1  306.5   0  35
sd5       4.3   31.0  369.6  973.3  0.0 22.0  622.0   0  96
                 extended device statistics
device    r/s    w/s   kr/s   kw/s wait actv  svc_t  %w  %b
sd0       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
sd1      17.1    0.0 2184.6    0.0  0.0  0.5   30.6   0   2
sd2       1.6   12.3  116.4  570.9  0.0  0.6   41.3   0   3
sd3       1.6   12.1  107.6  570.9  0.0 10.3  754.7   0  33
sd4       2.1   12.6  187.1  569.4  0.0  9.4  634.7   0  28
sd5       0.4   21.7   25.6  700.6  0.0 29.5 1338.1   0  96


2) cp of a big file to a ZFS filesystem (16K recordsize) :
============================================================iostat -x 30
                 extended device statistics
device    r/s    w/s   kr/s   kw/s wait actv  svc_t  %w  %b
sd0       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
sd1       0.2    0.3   16.7    2.3  0.0  0.0   19.3   0   0
sd2      11.5    6.0  350.7  154.5  0.0  0.3   19.5   0   4
sd3      12.5    5.7  352.0  154.5  0.0  0.5   27.0   0   5
sd4      15.9    6.3  616.2  153.8  0.0  1.3   58.0   0   8
sd5      15.1    8.1  601.3  150.7  0.0  7.5  324.6   0  31
                 extended device statistics
device    r/s    w/s   kr/s   kw/s wait actv  svc_t  %w  %b
sd0       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
sd1      32.0    0.0 4095.9    0.0  0.0  1.0   30.8   0   3
sd2       2.0   22.4  124.2  425.0  0.0  0.1    2.3   0   2
sd3       1.9   19.4  115.9  425.0  0.0  0.6   28.7   0  14
sd4       2.3   23.6  170.9  421.8  0.0  3.2  124.7   0  15
sd5       3.2   24.5  290.6  306.6  0.0 22.5  810.5   0  94
                 extended device statistics
device    r/s    w/s   kr/s   kw/s wait actv  svc_t  %w  %b
sd0       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
sd1       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
sd2       0.0    2.0    0.0    3.0  0.0  0.0    0.7   0   0
sd3       0.1    1.1    4.3    2.0  0.0  0.0   15.9   0   1
sd4       0.1    1.4    4.3    1.9  0.0  0.0    2.9   0   0
sd5       0.2   19.8   10.7  101.8  0.0 32.1 1606.9   0 100
                 extended device statistics
device    r/s    w/s   kr/s   kw/s wait actv  svc_t  %w  %b
sd0       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
sd1       8.6    0.0 1096.2    0.0  0.0  0.3   29.7   0   1
sd2       0.2    4.8   10.7  267.2  0.0  0.0    7.8   0   0
sd3       0.2    5.5    6.8  268.2  0.0  0.6  107.0   0   3
sd4       0.2    9.1   11.0  265.4  0.0  6.3  678.4   0  21
sd5       0.2   21.4    6.8  104.5  0.0 31.6 1467.8   0  92
                 extended device statistics
device    r/s    w/s   kr/s   kw/s wait actv  svc_t  %w  %b
sd0       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
sd1       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
sd2       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
sd3       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
sd4       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
sd5       0.0   18.9    0.0  101.7  0.0 35.0 1851.6   0 100
                 extended device statistics
device    r/s    w/s   kr/s   kw/s wait actv  svc_t  %w  %b
sd0       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
sd1       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
sd2       0.3    5.9   15.3  279.2  0.0  0.0    6.7   0   1
sd3       0.4    5.7   23.5  279.2  0.0  1.0  161.5   0   5
sd4       0.4   11.6   23.8  275.6  0.0 11.6  964.3   0  36
sd5       0.2   20.6   13.1  107.2  0.0 30.2 1452.7   0  99
                 extended device statistics
device    r/s    w/s   kr/s   kw/s wait actv  svc_t  %w  %b
sd0       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
sd1       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
sd2       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
sd3       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
sd4       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
sd5       0.0   20.1    0.0  105.7  0.0 35.0 1741.2   0 100
                 extended device statistics
device    r/s    w/s   kr/s   kw/s wait actv  svc_t  %w  %b
sd0       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
sd1       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
sd2       0.1    4.3    6.4  196.4  0.0  0.1   13.8   0   1
sd3       0.2    4.0   10.7  196.4  0.0  0.1   15.9   0   1
sd4       0.3    5.5   17.1  195.6  0.0  0.2   31.3   0   3
sd5       0.3   22.5   17.1  127.4  0.0 31.4 1378.4   0  99


Thanks,
Philippe
-- 
This message posted from opensolaris.org

John J Balestrini

2010-May-18 15:11 UTC

head link

[zfs-discuss] Very serious performance degradation

Howdy,

Is dedup on? I was having some pretty strange problems including slow
performance when dedup was on. Disabling dedup helped out a whole bunch. My
system only has 4gig of ram, so that may have played a part too.

Good luck!

John


On May 18, 2010, at 7:51 AM, Philippe wrote:
> Hi,
> 
> The 4 disks are Western Digital ATA 1TB (one is slighlty different) :
> 1 x ATA-WDC WD10EACS-00D-1A01-931.51GB
> 3 x ATA-WDC WD10EARS-00Y-0A80-931.51GB
> 
> I''ve done lots of tests (speed tests + SMART reports) with each of
these 4 disk on another system (another computer, running Windows 2003 x64), and
everything was fine ! The 4 disks operate well, at 50-100 MB/s (tested with
Hdtune). And the access time : 14ms
> 
> The controller is an LSI Logic SAS 1068-IR (MPT BIOS 6.12.00.00 -
31/10/2006)
> 
> Here are some stats :
> 
> 1) cp of a big file to a ZFS filesystem (128K recordsize) :
> ============================================================> iostat -x
30
>                 extended device statistics
> device    r/s    w/s   kr/s   kw/s wait actv  svc_t  %w  %b
> sd0       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd1       0.3    0.3   17.6    2.3  0.0  0.0   19.5   0   0
> sd2      11.5    6.0  350.1  154.5  0.0  0.3   19.5   0   4
> sd3      12.5    5.7  351.4  154.5  0.0  0.5   27.1   0   5
> sd4      15.9    6.3  615.1  153.8  0.0  1.3   58.2   0   8
> sd5      15.1    8.1  600.4  150.7  0.0  7.6  326.7   0  31
>                 extended device statistics
> device    r/s    w/s   kr/s   kw/s wait actv  svc_t  %w  %b
> sd0       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd1      41.3    0.0 5289.7    0.0  0.0  1.3   31.0   0   4
> sd2       4.2   24.1  214.0 1183.0  0.0  0.5   19.4   0   4
> sd3       3.7   23.6  227.2 1183.0  0.0  2.1   78.5   0  12
> sd4       6.6   26.4  374.2 1179.4  0.0 10.1  306.5   0  35
> sd5       4.3   31.0  369.6  973.3  0.0 22.0  622.0   0  96
>                 extended device statistics
> device    r/s    w/s   kr/s   kw/s wait actv  svc_t  %w  %b
> sd0       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd1      17.1    0.0 2184.6    0.0  0.0  0.5   30.6   0   2
> sd2       1.6   12.3  116.4  570.9  0.0  0.6   41.3   0   3
> sd3       1.6   12.1  107.6  570.9  0.0 10.3  754.7   0  33
> sd4       2.1   12.6  187.1  569.4  0.0  9.4  634.7   0  28
> sd5       0.4   21.7   25.6  700.6  0.0 29.5 1338.1   0  96
> 
> 
> 2) cp of a big file to a ZFS filesystem (16K recordsize) :
> ============================================================> iostat -x
30
>                 extended device statistics
> device    r/s    w/s   kr/s   kw/s wait actv  svc_t  %w  %b
> sd0       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd1       0.2    0.3   16.7    2.3  0.0  0.0   19.3   0   0
> sd2      11.5    6.0  350.7  154.5  0.0  0.3   19.5   0   4
> sd3      12.5    5.7  352.0  154.5  0.0  0.5   27.0   0   5
> sd4      15.9    6.3  616.2  153.8  0.0  1.3   58.0   0   8
> sd5      15.1    8.1  601.3  150.7  0.0  7.5  324.6   0  31
>                 extended device statistics
> device    r/s    w/s   kr/s   kw/s wait actv  svc_t  %w  %b
> sd0       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd1      32.0    0.0 4095.9    0.0  0.0  1.0   30.8   0   3
> sd2       2.0   22.4  124.2  425.0  0.0  0.1    2.3   0   2
> sd3       1.9   19.4  115.9  425.0  0.0  0.6   28.7   0  14
> sd4       2.3   23.6  170.9  421.8  0.0  3.2  124.7   0  15
> sd5       3.2   24.5  290.6  306.6  0.0 22.5  810.5   0  94
>                 extended device statistics
> device    r/s    w/s   kr/s   kw/s wait actv  svc_t  %w  %b
> sd0       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd1       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd2       0.0    2.0    0.0    3.0  0.0  0.0    0.7   0   0
> sd3       0.1    1.1    4.3    2.0  0.0  0.0   15.9   0   1
> sd4       0.1    1.4    4.3    1.9  0.0  0.0    2.9   0   0
> sd5       0.2   19.8   10.7  101.8  0.0 32.1 1606.9   0 100
>                 extended device statistics
> device    r/s    w/s   kr/s   kw/s wait actv  svc_t  %w  %b
> sd0       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd1       8.6    0.0 1096.2    0.0  0.0  0.3   29.7   0   1
> sd2       0.2    4.8   10.7  267.2  0.0  0.0    7.8   0   0
> sd3       0.2    5.5    6.8  268.2  0.0  0.6  107.0   0   3
> sd4       0.2    9.1   11.0  265.4  0.0  6.3  678.4   0  21
> sd5       0.2   21.4    6.8  104.5  0.0 31.6 1467.8   0  92
>                 extended device statistics
> device    r/s    w/s   kr/s   kw/s wait actv  svc_t  %w  %b
> sd0       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd1       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd2       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd3       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd4       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd5       0.0   18.9    0.0  101.7  0.0 35.0 1851.6   0 100
>                 extended device statistics
> device    r/s    w/s   kr/s   kw/s wait actv  svc_t  %w  %b
> sd0       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd1       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd2       0.3    5.9   15.3  279.2  0.0  0.0    6.7   0   1
> sd3       0.4    5.7   23.5  279.2  0.0  1.0  161.5   0   5
> sd4       0.4   11.6   23.8  275.6  0.0 11.6  964.3   0  36
> sd5       0.2   20.6   13.1  107.2  0.0 30.2 1452.7   0  99
>                 extended device statistics
> device    r/s    w/s   kr/s   kw/s wait actv  svc_t  %w  %b
> sd0       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd1       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd2       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd3       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd4       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd5       0.0   20.1    0.0  105.7  0.0 35.0 1741.2   0 100
>                 extended device statistics
> device    r/s    w/s   kr/s   kw/s wait actv  svc_t  %w  %b
> sd0       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd1       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd2       0.1    4.3    6.4  196.4  0.0  0.1   13.8   0   1
> sd3       0.2    4.0   10.7  196.4  0.0  0.1   15.9   0   1
> sd4       0.3    5.5   17.1  195.6  0.0  0.2   31.3   0   3
> sd5       0.3   22.5   17.1  127.4  0.0 31.4 1378.4   0  99
> 
> 
> Thanks,
> Philippe
> -- 
> This message posted from opensolaris.org
> _______________________________________________
> zfs-discuss mailing list
> zfs-discuss at opensolaris.org
> http://mail.opensolaris.org/mailman/listinfo/zfs-discuss

Tomas Ögren

2010-May-18 15:38 UTC

head link

[zfs-discuss] Very serious performance degradation

On 18 May, 2010 - Philippe sent me these 6,0K bytes:
> Hi,
> 
> The 4 disks are Western Digital ATA 1TB (one is slighlty different) :
>  1 x ATA-WDC WD10EACS-00D-1A01-931.51GB
>  3 x ATA-WDC WD10EARS-00Y-0A80-931.51GB
> 
> I''ve done lots of tests (speed tests + SMART reports) with each of
these 4 disk on another system (another computer, running Windows 2003 x64), and
everything was fine ! The 4 disks operate well, at 50-100 MB/s (tested with
Hdtune). And the access time : 14ms
> 
> The controller is an LSI Logic SAS 1068-IR (MPT BIOS 6.12.00.00 -
31/10/2006)
> 
> Here are some stats :
> 
> 1) cp of a big file to a ZFS filesystem (128K recordsize) :
> ============================================================> iostat -x
30
>                  extended device statistics
> device    r/s    w/s   kr/s   kw/s wait actv  svc_t  %w  %b
> sd0       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd1       0.3    0.3   17.6    2.3  0.0  0.0   19.5   0   0
> sd2      11.5    6.0  350.1  154.5  0.0  0.3   19.5   0   4
> sd3      12.5    5.7  351.4  154.5  0.0  0.5   27.1   0   5
> sd4      15.9    6.3  615.1  153.8  0.0  1.3   58.2   0   8
> sd5      15.1    8.1  600.4  150.7  0.0  7.6  326.7   0  31
>                  extended device statistics
> device    r/s    w/s   kr/s   kw/s wait actv  svc_t  %w  %b
> sd0       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd1      41.3    0.0 5289.7    0.0  0.0  1.3   31.0   0   4
> sd2       4.2   24.1  214.0 1183.0  0.0  0.5   19.4   0   4
> sd3       3.7   23.6  227.2 1183.0  0.0  2.1   78.5   0  12
> sd4       6.6   26.4  374.2 1179.4  0.0 10.1  306.5   0  35
> sd5       4.3   31.0  369.6  973.3  0.0 22.0  622.0   0  96
>                  extended device statistics
> device    r/s    w/s   kr/s   kw/s wait actv  svc_t  %w  %b
> sd0       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd1      17.1    0.0 2184.6    0.0  0.0  0.5   30.6   0   2
> sd2       1.6   12.3  116.4  570.9  0.0  0.6   41.3   0   3
> sd3       1.6   12.1  107.6  570.9  0.0 10.3  754.7   0  33
> sd4       2.1   12.6  187.1  569.4  0.0  9.4  634.7   0  28
> sd5       0.4   21.7   25.6  700.6  0.0 29.5 1338.1   0  96
Umm.. Service time of sd3..5 are waay too high to be good working disks.
21 writes shouldn''t take 1.3 seconds.

Some of your disks are not feeling well, possibly doing
block-reallocation like mad all the time, or block recovery of some
form. Service times should be closer to what sd1 and 2 are doing.
sd2,3,4 seems to be getting about the same amount of read+write, but
their service time is 15-20 times higher. This will lead to crap
performance (and probably broken array in a while).

/Tomas
-- 
Tomas ?gren, stric at acc.umu.se, http://www.acc.umu.se/~stric/
|- Student at Computing Science, University of Ume?
`- Sysadmin at {cs,acc}.umu.se

Matt Cowger

2010-May-18 15:40 UTC

head link

[zfs-discuss] Very serious performance degradation

I note in your iostat data below that one drive (sd5) consistently performs MUCH
worse than the others, even when doing less work.....

-----Original Message-----
From: zfs-discuss-bounces at opensolaris.org [mailto:zfs-discuss-bounces at
opensolaris.org] On Behalf Of John J Balestrini
Sent: Tuesday, May 18, 2010 8:11 AM
To: OpenSolaris ZFS discuss
Subject: Re: [zfs-discuss] Very serious performance degradation

Howdy,

Is dedup on? I was having some pretty strange problems including slow
performance when dedup was on. Disabling dedup helped out a whole bunch. My
system only has 4gig of ram, so that may have played a part too.

Good luck!

John


On May 18, 2010, at 7:51 AM, Philippe wrote:
> Hi,
> 
> The 4 disks are Western Digital ATA 1TB (one is slighlty different) :
> 1 x ATA-WDC WD10EACS-00D-1A01-931.51GB
> 3 x ATA-WDC WD10EARS-00Y-0A80-931.51GB
> 
> I''ve done lots of tests (speed tests + SMART reports) with each of
these 4 disk on another system (another computer, running Windows 2003 x64), and
everything was fine ! The 4 disks operate well, at 50-100 MB/s (tested with
Hdtune). And the access time : 14ms
> 
> The controller is an LSI Logic SAS 1068-IR (MPT BIOS 6.12.00.00 -
31/10/2006)
> 
> Here are some stats :
> 
> 1) cp of a big file to a ZFS filesystem (128K recordsize) :
> ============================================================> iostat -x
30
>                 extended device statistics
> device    r/s    w/s   kr/s   kw/s wait actv  svc_t  %w  %b
> sd0       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd1       0.3    0.3   17.6    2.3  0.0  0.0   19.5   0   0
> sd2      11.5    6.0  350.1  154.5  0.0  0.3   19.5   0   4
> sd3      12.5    5.7  351.4  154.5  0.0  0.5   27.1   0   5
> sd4      15.9    6.3  615.1  153.8  0.0  1.3   58.2   0   8
> sd5      15.1    8.1  600.4  150.7  0.0  7.6  326.7   0  31
>                 extended device statistics
> device    r/s    w/s   kr/s   kw/s wait actv  svc_t  %w  %b
> sd0       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd1      41.3    0.0 5289.7    0.0  0.0  1.3   31.0   0   4
> sd2       4.2   24.1  214.0 1183.0  0.0  0.5   19.4   0   4
> sd3       3.7   23.6  227.2 1183.0  0.0  2.1   78.5   0  12
> sd4       6.6   26.4  374.2 1179.4  0.0 10.1  306.5   0  35
> sd5       4.3   31.0  369.6  973.3  0.0 22.0  622.0   0  96
>                 extended device statistics
> device    r/s    w/s   kr/s   kw/s wait actv  svc_t  %w  %b
> sd0       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd1      17.1    0.0 2184.6    0.0  0.0  0.5   30.6   0   2
> sd2       1.6   12.3  116.4  570.9  0.0  0.6   41.3   0   3
> sd3       1.6   12.1  107.6  570.9  0.0 10.3  754.7   0  33
> sd4       2.1   12.6  187.1  569.4  0.0  9.4  634.7   0  28
> sd5       0.4   21.7   25.6  700.6  0.0 29.5 1338.1   0  96
> 
> 
> 2) cp of a big file to a ZFS filesystem (16K recordsize) :
> ============================================================> iostat -x
30
>                 extended device statistics
> device    r/s    w/s   kr/s   kw/s wait actv  svc_t  %w  %b
> sd0       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd1       0.2    0.3   16.7    2.3  0.0  0.0   19.3   0   0
> sd2      11.5    6.0  350.7  154.5  0.0  0.3   19.5   0   4
> sd3      12.5    5.7  352.0  154.5  0.0  0.5   27.0   0   5
> sd4      15.9    6.3  616.2  153.8  0.0  1.3   58.0   0   8
> sd5      15.1    8.1  601.3  150.7  0.0  7.5  324.6   0  31
>                 extended device statistics
> device    r/s    w/s   kr/s   kw/s wait actv  svc_t  %w  %b
> sd0       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd1      32.0    0.0 4095.9    0.0  0.0  1.0   30.8   0   3
> sd2       2.0   22.4  124.2  425.0  0.0  0.1    2.3   0   2
> sd3       1.9   19.4  115.9  425.0  0.0  0.6   28.7   0  14
> sd4       2.3   23.6  170.9  421.8  0.0  3.2  124.7   0  15
> sd5       3.2   24.5  290.6  306.6  0.0 22.5  810.5   0  94
>                 extended device statistics
> device    r/s    w/s   kr/s   kw/s wait actv  svc_t  %w  %b
> sd0       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd1       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd2       0.0    2.0    0.0    3.0  0.0  0.0    0.7   0   0
> sd3       0.1    1.1    4.3    2.0  0.0  0.0   15.9   0   1
> sd4       0.1    1.4    4.3    1.9  0.0  0.0    2.9   0   0
> sd5       0.2   19.8   10.7  101.8  0.0 32.1 1606.9   0 100
>                 extended device statistics
> device    r/s    w/s   kr/s   kw/s wait actv  svc_t  %w  %b
> sd0       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd1       8.6    0.0 1096.2    0.0  0.0  0.3   29.7   0   1
> sd2       0.2    4.8   10.7  267.2  0.0  0.0    7.8   0   0
> sd3       0.2    5.5    6.8  268.2  0.0  0.6  107.0   0   3
> sd4       0.2    9.1   11.0  265.4  0.0  6.3  678.4   0  21
> sd5       0.2   21.4    6.8  104.5  0.0 31.6 1467.8   0  92
>                 extended device statistics
> device    r/s    w/s   kr/s   kw/s wait actv  svc_t  %w  %b
> sd0       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd1       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd2       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd3       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd4       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd5       0.0   18.9    0.0  101.7  0.0 35.0 1851.6   0 100
>                 extended device statistics
> device    r/s    w/s   kr/s   kw/s wait actv  svc_t  %w  %b
> sd0       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd1       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd2       0.3    5.9   15.3  279.2  0.0  0.0    6.7   0   1
> sd3       0.4    5.7   23.5  279.2  0.0  1.0  161.5   0   5
> sd4       0.4   11.6   23.8  275.6  0.0 11.6  964.3   0  36
> sd5       0.2   20.6   13.1  107.2  0.0 30.2 1452.7   0  99
>                 extended device statistics
> device    r/s    w/s   kr/s   kw/s wait actv  svc_t  %w  %b
> sd0       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd1       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd2       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd3       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd4       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd5       0.0   20.1    0.0  105.7  0.0 35.0 1741.2   0 100
>                 extended device statistics
> device    r/s    w/s   kr/s   kw/s wait actv  svc_t  %w  %b
> sd0       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd1       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd2       0.1    4.3    6.4  196.4  0.0  0.1   13.8   0   1
> sd3       0.2    4.0   10.7  196.4  0.0  0.1   15.9   0   1
> sd4       0.3    5.5   17.1  195.6  0.0  0.2   31.3   0   3
> sd5       0.3   22.5   17.1  127.4  0.0 31.4 1378.4   0  99
> 
> 
> Thanks,
> Philippe
> -- 
> This message posted from opensolaris.org
> _______________________________________________
> zfs-discuss mailing list
> zfs-discuss at opensolaris.org
> http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
_______________________________________________
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Bob Friesenhahn

2010-May-18 15:41 UTC

head link

[zfs-discuss] Very serious performance degradation

On Tue, 18 May 2010, Philippe wrote:
> The 4 disks are Western Digital ATA 1TB (one is slighlty different) :
> 1 x ATA-WDC WD10EACS-00D-1A01-931.51GB
> 3 x ATA-WDC WD10EARS-00Y-0A80-931.51GB
>
> I''ve done lots of tests (speed tests + SMART reports) with each of
these 4 disk on another system (another computer, running Windows 2003 x64), and
everything was fine ! The 4 disks operate well, at 50-100 MB/s (tested with
Hdtune). And the access time : 14ms
>
> The controller is an LSI Logic SAS 1068-IR (MPT BIOS 6.12.00.00 -
31/10/2006)
>
> Here are some stats :
>                 extended device statistics
> device    r/s    w/s   kr/s   kw/s wait actv  svc_t  %w  %b
> sd0       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
> sd1       8.6    0.0 1096.2    0.0  0.0  0.3   29.7   0   1
> sd2       0.2    4.8   10.7  267.2  0.0  0.0    7.8   0   0
> sd3       0.2    5.5    6.8  268.2  0.0  0.6  107.0   0   3
> sd4       0.2    9.1   11.0  265.4  0.0  6.3  678.4   0  21
> sd5       0.2   21.4    6.8  104.5  0.0 31.6 1467.8   0  92
It looks like your ''sd5'' disk is performing horribly bad and
except
for the horrible performance of ''sd5'' (which bottlenecks the
I/O),
''sd4'' would look just as bad.  Regardless, the first step
would be to
investigate ''sd5''.  If ''sd4'' is also a
terrible performer, then
resilvering a disk replacement of ''sd5'' may take a very long
time.

Use ''iostat -xen'' to obtain more information, including the
number of
reported errors.

Bob
-- 
Bob Friesenhahn
bfriesen at simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/

Edward Ned Harvey

2010-May-19 00:55 UTC

head link

[zfs-discuss] Very serious performance degradation

How full is your filesystem?  Give us the output of "zfs list"
You might be having a hardware problem, or maybe it''s extremely full.

Also, if you have dedup enabled, on a 3TB filesystem, you surely want more
RAM.  I don''t know if there''s any rule of thumb you could
follow, but
offhand I''d say 16G or 32G.  Numbers based on the vapor passing around
the
room I''m in right now.

Philippe

2010-May-19 09:34 UTC

head link

[zfs-discuss] Very serious performance degradation

> mm.. Service time of sd3..5 are waay too high to be
> good working disks.
> 21 writes shouldn''t take 1.3 seconds.
> 
> Some of your disks are not feeling well, possibly
> doing
> block-reallocation like mad all the time, or block
> recovery of some
> form. Service times should be closer to what sd1 and
> 2 are doing.
> sd2,3,4 seems to be getting about the same amount of
> read+write, but
> their service time is 15-20 times higher. This will
> lead to crap
> performance (and probably broken array in a while).
> 
> /Tomas
Hi !

It is strange because I''ve checked the SMART data of the 4 disks, and
everything seems really OK ! (on another hardware/controller, because I needed
Windows to check it). Maybe it''s a problem with the SAS/SATA controller
?!

One question : if I halt the server, and change the order of the disks on the
SATA array, will RAIDZ still detect the array fine ????
The idea is to check if the results (big service times) depends on the drives
position, or on the hard drives themself !

Thank you !
-- 
This message posted from opensolaris.org

Philippe

2010-May-19 09:46 UTC

head link

[zfs-discuss] Very serious performance degradation

> How full is your filesystem?  Give us the output of
> "zfs list"
> You might be having a hardware problem, or maybe it''s
> extremely full.
Hi Edward,

The "_db" filesystems have a recordsise of 16K (the others have the
default 128K) :

NAME                          USED  AVAIL  REFER  MOUNTPOINT
zfs_raid                     1,02T  1,65T  28,4K  /zfs_raid
zfs_raid/fs1_db              8,89G  1,65T  7,73G  /home/fs1_db
zfs_raid/fs2                 2,68G  1,65T  1,73G  /home/fs2
zfs_raid/fs3                 3,38G  1,65T  3,12G  /home/fs3
zfs_raid/fs4                 10,1G  1,65T  10,0G  /home/fs4
zfs_raid/fs5                  517G  1,65T   326G  /home/fs5
zfs_raid/fs6_db              35,1G  1,65T  28,0G  /home/fs6_db
zfs_raid/fs7                 9,22G  1,65T  7,67G  /home/fs7
zfs_raid/fs8_db              22,7G  1,65T  21,6G  /home/fs8_db
zfs_raid/fs9                  179G  1,65T   108G  /home/fs9
zfs_raid/fs10                 115G  1,65T  97,0G  /home/fs10
zfs_raid/fs11_db             28,6G  1,65T  17,3G  /home/fs11_db
zfs_raid/fs12                17,1G  1,65T  4,70G  /home/fs12
zfs_raid/fs13                9,66G  1,65T  6,77G  /home/fs13
zfs_raid/fs14                4,13G  1,65T  3,12G  /home/fs14
zfs_raid/fs15                15,2G  1,65T  9,48G  /home/fs15
zfs_raid/fs16                14,7G  1,65T  6,59G  /home/fs16
zfs_raid/fs17                7,49G  1,65T  5,31G  /home/fs17
zfs_raid/fs18                41,0G  1,65T  21,6G  /home/fs18

> Also, if you have dedup enabled, on a 3TB filesystem,
> you surely want more
> RAM.  I don''t know if there''s any rule of thumb you
> could follow, but
> offhand I''d say 16G or 32G.  Numbers based on the
> vapor passing around the
> room I''m in right now.
It seems that the "dedup" property doesn''t exist on my system
! Are you sure this capability is supported on the version of ZFS included in
Opensolaris ?

Thank you !
Philippe
-- 
This message posted from opensolaris.org

Ian Collins

2010-May-19 09:51 UTC

head link

[zfs-discuss] Very serious performance degradation

On 05/19/10 09:34 PM, Philippe wrote:> Hi !
>
> It is strange because I''ve checked the SMART data of the 4 disks,
and everything seems really OK ! (on another hardware/controller, because I
needed Windows to check it). Maybe it''s a problem with the SAS/SATA
controller ?!
>
> One question : if I halt the server, and change the order of the disks on
the SATA array, will RAIDZ still detect the array fine ????
>    
Yes, it will.

-- 
Ian.

Philippe

2010-May-19 09:55 UTC

head link

[zfs-discuss] Very serious performance degradation

> it looks like your ''sd5'' disk is performing horribly
> bad and except 
> for the horrible performance of ''sd5'' (which
> bottlenecks the I/O), 
> ''sd4'' would look just as bad.  Regardless, the first
> step would be to 
> investigate ''sd5''.
Hi Bob !

I''ve already tried the pool without the sd5 disk (so pool in degraded
mode), but the performances was still the same... So the sd5 disk itself is not
the (only) bottleneck...

> Use ''iostat -xen'' to obtain more information,
> including the number of 
> reported errors.
iostat -xen
                            extended device statistics       ---- errors ---
    r/s    w/s   kr/s   kw/s wait actv wsvc_t asvc_t  %w  %b s/w h/w trn tot
device
    0.0    0.0    0.0    0.0  0.0  0.0    0.0    0.0   0   0   0   9   0   9
c8t0d0
    0.3    0.4   14.1    3.2  0.0  0.0    0.0   17.9   0   0   0   0   0   0
c7t0d0
   65.5    6.6 1234.3   97.6  0.0  1.0    0.0   14.5   0  14   0   0   0   0
c7t2d0
   70.6    6.1 1229.2   97.6  0.0  1.3    0.0   16.3   0  16   0   0   0   0
c7t3d0
   94.0    6.7 2349.2   97.0  0.0  3.6    0.0   36.1   0  23   0   0   0   0
c7t4d0
   80.4   12.1 2306.5   91.3  0.0 16.6    0.0  179.7   0  68   0   0   0   0
c7t5d0

Thanks !
-- 
This message posted from opensolaris.org

Philippe

2010-May-20 10:45 UTC

head link

[zfs-discuss] Very serious performance degradation

> > One question : if I halt the server, and change the
> order of the disks on the SATA array, will RAIDZ
> still detect the array fine ????
> >    
> 
> Yes, it will.
Hi !

I''ve done the moves this morning, and the high service times followed
the disks !
So, I have 3 disks to replace urgently !!

I''m starting with the replacement of the very bad disk, and hope the
resilvering won''t take too long !! I have no choice !

Thanks to all !
Philippe
-- 
This message posted from opensolaris.org

Philippe

2010-May-20 11:12 UTC

head link

[zfs-discuss] Very serious performance degradation

> I''m starting with the replacement of the very bad
> disk, and hope the resilvering won''t take too long !!
Replacing c7t2d0, I get the following :

        NAME              STATE     READ WRITE CKSUM
        zfs_raid          DEGRADED     0     0     0
          raidz1          DEGRADED     0     0     0
            c7t5d0        ONLINE       0     0     0
            c7t4d0        ONLINE       0     0     0
            c7t3d0        ONLINE       0     0     0
            replacing     DEGRADED     0     0 1,42K
              c7t2d0s0/o  FAULTED      0     0     0  corrupted data
              c7t2d0      ONLINE       0     0     0  2,92M resilvered

Why there is a faulted "c7t2d0s0/o" appearing ??
Maybe this was on the disk before the replacement ?

When I''ve done the "zpool replace", I had to add
"-f" to force, because ZFS told that these was a ZFS label on the
disk, and that vdevs where not ok...
How to get rid of this, and get a normal "c7t2d0" ??

Thank you !
Philippe
-- 
This message posted from opensolaris.org

Philippe

2010-May-20 11:24 UTC

head link

[zfs-discuss] Very serious performance degradation

Current status :

  pool: zfs_raid
 state: DEGRADED
status: One or more devices is currently being resilvered.  The pool will
        continue to function, possibly in a degraded state.
action: Wait for the resilver to complete.
 scrub: resilver in progress for 0h17m, 3,72% done, 7h22m to go
config:

        NAME              STATE     READ WRITE CKSUM
        zfs_raid          DEGRADED     0     0     0
          raidz1          DEGRADED     0     0     0
            c7t5d0        ONLINE       0     0     0
            c7t4d0        ONLINE       0     0     0
            c7t3d0        ONLINE       0     0     0
            replacing     DEGRADED     0     0  339K
              c7t2d0s0/o  FAULTED      0     0     0  corrupted data
              c7t2d0      ONLINE       0     0     0  12,5G resilvered

errors: No known data errors

Any idea ?
-- 
This message posted from opensolaris.org

Edward Ned Harvey

2010-May-20 11:46 UTC

head link

[zfs-discuss] Very serious performance degradation

> From: zfs-discuss-bounces at opensolaris.org [mailto:zfs-discuss-
> bounces at opensolaris.org] On Behalf Of Philippe
> 
>               c7t2d0s0/o  FAULTED      0     0     0  corrupted data
> 
> When I''ve done the "zpool replace", I had to add
"-f" to force, because
> ZFS told that these was a ZFS label on the disk, and that vdevs where
> not ok...
> How to get rid of this, and get a normal "c7t2d0" ??
There''s more than one way, but this should work:
	zpool create trashpooljunk c7t2d0
	zpool destroy trashpooljunk

	and then repeat your zpool replace

Also, since you''ve got "s0" on there, it means
you''ve got some partitions on
that drive.  You could manually wipe all that out via format, but the above
is pretty brainless and reliable.

Richard Elling

2010-May-20 11:47 UTC

head link

[zfs-discuss] Very serious performance degradation

On May 20, 2010, at 4:12 AM, Philippe wrote:
>> I''m starting with the replacement of the very bad
>> disk, and hope the resilvering won''t take too long !!
> 
> Replacing c7t2d0, I get the following :
> 
>        NAME              STATE     READ WRITE CKSUM
>        zfs_raid          DEGRADED     0     0     0
>          raidz1          DEGRADED     0     0     0
>            c7t5d0        ONLINE       0     0     0
>            c7t4d0        ONLINE       0     0     0
>            c7t3d0        ONLINE       0     0     0
>            replacing     DEGRADED     0     0 1,42K
>              c7t2d0s0/o  FAULTED      0     0     0  corrupted data
>              c7t2d0      ONLINE       0     0     0  2,92M resilvered
> 
> Why there is a faulted "c7t2d0s0/o" appearing ??
That represents the "old" c7t2d0
> Maybe this was on the disk before the replacement ?
Not on the disk, it is the disk.
> When I''ve done the "zpool replace", I had to add
"-f" to force, because ZFS told that these was a ZFS label on the
disk, and that vdevs where not ok...
> How to get rid of this, and get a normal "c7t2d0" ??
Yes, ZFS is trying to prevent you from making mistakes. By default,
it will not clobber a disk that appears to be in use.

...and let the resilver complete.
 -- richard

-- 
ZFS and NexentaStor training, Rotterdam, July 13-15, 2010
http://nexenta-rotterdam.eventbrite.com/

Richard Elling

2010-May-20 11:51 UTC

head link

[zfs-discuss] Very serious performance degradation

On May 20, 2010, at 4:46 AM, Edward Ned Harvey wrote:
>> From: zfs-discuss-bounces at opensolaris.org [mailto:zfs-discuss-
>> bounces at opensolaris.org] On Behalf Of Philippe
>> 
>>              c7t2d0s0/o  FAULTED      0     0     0  corrupted data
>> 
>> When I''ve done the "zpool replace", I had to add
"-f" to force, because
>> ZFS told that these was a ZFS label on the disk, and that vdevs where
>> not ok...
>> How to get rid of this, and get a normal "c7t2d0" ??
> 
> There''s more than one way, but this should work:
> 	zpool create trashpooljunk c7t2d0
> 	zpool destroy trashpooljunk
Please don''t do this. 

ZFS identifies disks by their GUID, not their pathname.  ZFS has recognized 
that the new disk with path c7t2d0 is different than the old disk at that path.
This is a very common scenario. Once the replacement is complete, then 
the old disk will be forgotten.
 -- richard
> 
> 	and then repeat your zpool replace
> 
> Also, since you''ve got "s0" on there, it means
you''ve got some partitions on
> that drive.  You could manually wipe all that out via format, but the above
> is pretty brainless and reliable.
> 
> _______________________________________________
> zfs-discuss mailing list
> zfs-discuss at opensolaris.org
> http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
-- 
ZFS and NexentaStor training, Rotterdam, July 13-15, 2010
http://nexenta-rotterdam.eventbrite.com/

Richard Elling

2010-May-20 11:52 UTC

head link

[zfs-discuss] Very serious performance degradation

On May 20, 2010, at 4:24 AM, Philippe wrote:> Current status :
> 
>  pool: zfs_raid
> state: DEGRADED
> status: One or more devices is currently being resilvered.  The pool will
>        continue to function, possibly in a degraded state.
> action: Wait for the resilver to complete.
> scrub: resilver in progress for 0h17m, 3,72% done, 7h22m to go
> config:
> 
>        NAME              STATE     READ WRITE CKSUM
>        zfs_raid          DEGRADED     0     0     0
>          raidz1          DEGRADED     0     0     0
>            c7t5d0        ONLINE       0     0     0
>            c7t4d0        ONLINE       0     0     0
>            c7t3d0        ONLINE       0     0     0
>            replacing     DEGRADED     0     0  339K
>              c7t2d0s0/o  FAULTED      0     0     0  corrupted data
>              c7t2d0      ONLINE       0     0     0  12,5G resilvered
> 
> errors: No known data errors
> 
> Any idea ?
action: Wait for the resilver to complete.
 -- richard

-- 
ZFS and NexentaStor training, Rotterdam, July 13-15, 2010
http://nexenta-rotterdam.eventbrite.com/

Philippe

2010-May-20 12:16 UTC

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[zfs-discuss] Very serious performance degradation

>  Any idea ?
> action: Wait for the resilver to complete.
>  -- richard
Very fine ! And thank you a lot for your answers !
Philippe
-- 
This message posted from opensolaris.org

Darren J Moffat

2010-May-20 13:42 UTC

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[zfs-discuss] Very serious performance degradation

On 20/05/2010 12:46, Edward Ned Harvey wrote:> Also, since you''ve got "s0" on there, it means
you''ve got some partitions on
> that drive.
There are always partitions once the disk is in use by ZFS, but there 
may be 1 or more of them and they maybe SMI or EFI partitions.

So just because there is an s0 on the end doesn''t necessarily mean that
there is a non zero s1, s2 etc.

-- 
Darren J Moffat

Mark J Musante

2010-May-20 14:30 UTC

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[zfs-discuss] Very serious performance degradation

On Thu, 20 May 2010, Edward Ned Harvey wrote:
> Also, since you''ve got "s0" on there, it means
you''ve got some
> partitions on that drive.  You could manually wipe all that out via 
> format, but the above is pretty brainless and reliable.
The "s0" on the old disk is a bug in the way we''re formatting
the output.
This was fixed in CR 6881631.


Regards,
markm

Philippe

2010-May-21 09:33 UTC

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[zfs-discuss] Very serious performance degradation

> ...and let the resilver complete.
>  -- richard
Hi !

  pool: zfs_raid
 state: ONLINE
 scrub: resilver completed after 16h34m with 0 errors on Fri May 21 05:39:42
2010
config:

        NAME        STATE     READ WRITE CKSUM
        zfs_raid    ONLINE       0     0     0
          raidz1    ONLINE       0     0     0
            c7t5d0  ONLINE       0     0     0
            c7t4d0  ONLINE       0     0     0
            c7t3d0  ONLINE       0     0     0
            c7t2d0  ONLINE       0     0     0  326G resilvered

errors: No known data errors


Now, I just have to do the same drive replacement for the 2 other failing
drives...
Many thanks to you all !
Philippe
-- 
This message posted from opensolaris.org

Philippe

2010-May-21 10:48 UTC

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[zfs-discuss] Very serious performance degradation

> Now, I just have to do the same drive replacement for
> the 2 other failing drives...
For information, current iostat results :

                            extended device statistics       ---- errors ---
    r/s    w/s   kr/s   kw/s wait actv wsvc_t asvc_t  %w  %b s/w h/w trn tot
device
    0.0    0.0    0.0    0.0  0.0  0.0    0.0    0.0   0   0   0  11   0  11
c8t0d0
   44.9    0.0 5738.1    0.0  0.0  1.4    0.0   32.2   0   5   0   0   0   0
c7t0d0
    0.4  241.9    3.2 1172.2  0.0  2.7    0.0   11.1   0  10   0   0   0   0
c7t2d0
    0.4   31.2    3.2  846.2  0.0 28.2    0.0  891.2   0  89   0   0   0   0
c7t3d0
    0.3   18.5    1.2  576.3  0.0  7.5    0.0  398.4   0  24   0   0   0   0
c7t4d0
    0.3   38.4    2.5 1289.1  0.0  0.8    0.0   19.6   0   4   0   0   0   0
c7t5d0
                            extended device statistics       ---- errors ---
    r/s    w/s   kr/s   kw/s wait actv wsvc_t asvc_t  %w  %b s/w h/w trn tot
device
    0.0    0.0    0.0    0.0  0.0  0.0    0.0    0.0   0   0   0  11   0  11
c8t0d0
    0.0    0.0    3.2    0.0  0.0  0.0    0.0    4.2   0   0   0   0   0   0
c7t0d0
    0.0    0.0    0.1    0.0  0.0  0.0    0.0    9.7   0   0   0   0   0   0
c7t2d0
    0.0   27.6    0.1  701.3  0.0 35.0    0.0 1269.2   0 100   0   0   0   0
c7t3d0
    0.0   19.6    0.1  713.0  0.0 20.9    0.0 1066.5   0  61   0   0   0   0
c7t4d0
    0.0    0.0    0.0    0.0  0.0  0.0    0.0    0.0   0   0   0   0   0   0
c7t5d0

I really have to hurry up replacing c7t3d0 too (and next c7t4d0), cause they are
falling rapidly (compared to the results of yesterday) !!

Have a nice week-end,
Philippe
-- 
This message posted from opensolaris.org

Philippe

2010-May-21 11:11 UTC

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[zfs-discuss] Very serious performance degradation

Hi,

I known that ZFS is aware of I/O errors, and can alert or disable a crappy disk.
However, ZFS didn''t notice at all these "service time"
problems.

I think it is a good idea to integrate service time triggers in ZFS !
What to you think ?

Best regards !
Philippe
-- 
This message posted from opensolaris.org

Philippe

2010-May-21 13:23 UTC

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[zfs-discuss] Very serious performance degradation

Hi,

Actually, it seems a common problem with WD "EARS" drives (advanced
format) !

Please, see this other OpenSolaris thread :
https://opensolaris.org/jive/thread.jspa?threadID=126637

It is worth investigating !

I quote :
> Just replacing back, and here is the iostat for the new EARS drive:
> http://pastie.org/889572
> 
> Those asvc_t''s are atrocious. As is the op/s throughput. All the
other drives spend the vast
> majority of the time idle, waiting for the new EARS drive to write out
data.
> 
> This is after isolating another issue to my Dell PERC 5/i''s - they
apparently don''t talk nicely
> with the EARS drives either. Streaming writes would push data for two
seconds and pause
> for ten. Random writes ... give up.
> On the Intel chipset''s SATA - streaming writes are acceptable, but
random writes are as
> per the above url.
> 
> Format tells me that the partition starts at sector 256.But given that ZFS
writes variable
> size blocks, that really shouldn''t matter.
>
> When plugged the EARS into a P45-based motherboard running Windows, HDTune
> presents a normal looking streaming writes graph, and the average seek time
is 14ms -
> the drive seems healthy.-- 
This message posted from opensolaris.org

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