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John R Pierce

2010-Feb-28 21:03 UTC

[CentOS] puzzling md error ?

this has never happened to me before, and I'm somewhat at a loss.  got a 
email from the cron thing...

    /etc/cron.weekly/99-raid-check:

    WARNING: mismatch_cnt is not 0 on /dev/md10
    WARNING: mismatch_cnt is not 0 on /dev/md11


ok, md10 and md11 are each raid1's made from 2 x 72GB scsi drives, on a 
dell 2850 or something dual single-core 3ghz server.

these two md's are in turn a striped LVM volume group

dmesg shows....

    md: syncing RAID array md10
    md: minimum _guaranteed_ reconstruction speed: 1000 KB/sec/disc.
    md: using maximum available idle IO bandwidth (but not more than 
200000 KB/sec) for reconstruction.
    md: using 128k window, over a total of 143374656 blocks.
    md: syncing RAID array md11
    md: minimum _guaranteed_ reconstruction speed: 1000 KB/sec/disc.
    md: using maximum available idle IO bandwidth (but not more than 
200000 KB/sec) for reconstruction.
    md: using 128k window, over a total of 143374656 blocks.
    md: md10: sync done.
    RAID1 conf printout:
     --- wd:2 rd:2
     disk 0, wo:0, o:1, dev:sdc1
     disk 1, wo:0, o:1, dev:sdd1
    md: md11: sync done.
    RAID1 conf printout:
     --- wd:2 rd:2
     disk 0, wo:0, o:1, dev:sde1
     disk 1, wo:0, o:1, dev:sdf1

I'm not sure what thats telling me.  the last thing prior to this in 
dmesg was when I added a swap to this vg last week.


and mdadm --detail shows...

# mdadm --detail /dev/md10
/dev/md10:
        Version : 0.90
  Creation Time : Wed Oct  8 12:54:48 2008
     Raid Level : raid1
     Array Size : 143374656 (136.73 GiB 146.82 GB)
  Used Dev Size : 143374656 (136.73 GiB 146.82 GB)
   Raid Devices : 2
  Total Devices : 2
Preferred Minor : 10
    Persistence : Superblock is persistent

    Update Time : Sun Feb 28 04:53:29 2010
          State : clean
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0

           UUID : b6da4dc5:c7372d6e:63f32b9c:49fa95f9
         Events : 0.84

    Number   Major   Minor   RaidDevice State
       0       8       33        0      active sync   /dev/sdc1
       1       8       49        1      active sync   /dev/sdd1
# mdadm --detail /dev/md11
/dev/md11:
        Version : 0.90
  Creation Time : Wed Oct  8 12:54:57 2008
     Raid Level : raid1
     Array Size : 143374656 (136.73 GiB 146.82 GB)
  Used Dev Size : 143374656 (136.73 GiB 146.82 GB)
   Raid Devices : 2
  Total Devices : 2
Preferred Minor : 11
    Persistence : Superblock is persistent

    Update Time : Sun Feb 28 11:49:45 2010
          State : clean
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0

           UUID : be475cd9:b98ee3ff:d18e668c:a5a6e06b
         Events : 0.62

    Number   Major   Minor   RaidDevice State
       0       8       65        0      active sync   /dev/sde1
       1       8       81        1      active sync   /dev/sdf1



I don't see anything wrong here ?

lvm shows no problems I detect either...

# vgdisplay vg1
  Volume group "vgdisplay" not found
  LV             VG   Attr   LSize  Origin Snap%  Move Log Copy%  Convert
  glassfish      vg1  -wi-ao 10.00G                                     
  lv1            vg1  -wi-ao 97.66G                                     
  oradata        vg1  -wi-ao 30.00G                                     
  pgdata         vg1  -wi-ao 25.00G                                     
  pgdata_lss_idx vg1  -wi-ao 20.00G                                     
  pgdata_lss_tab vg1  -wi-ao 20.00G                                     
  swapper        vg1  -wi-ao  3.00G                                     
  vmware         vg1  -wi-ao 50.00G             


# pvdisplay /dev/md10 /dev/md11
  --- Physical volume ---
  PV Name               /dev/md10
  VG Name               vg1
  PV Size               136.73 GB / not usable 2.31 MB
  Allocatable           yes
  PE Size (KByte)       4096
  Total PE              35003
  Free PE               1998
  Allocated PE          33005
  PV UUID               oAgJY7-Tmf7-ac35-KoUH-15uz-Q5Ae-bmFCys
  
  --- Physical volume ---
  PV Name               /dev/md11
  VG Name               vg1
  PV Size               136.73 GB / not usable 2.31 MB
  Allocatable           yes
  PE Size (KByte)       4096
  Total PE              35003
  Free PE               2560
  Allocated PE          32443
  PV UUID               A4Qb3P-j5Lr-8ZEv-FjbC-Iczm-QkC8-bqP0zv

Eero Volotinen

2010-Feb-28 21:15 UTC

head link

[CentOS] puzzling md error ?

2010/2/28 John R Pierce <pierce at hogranch.com>:> this has never happened to me before, and I'm somewhat at a loss. ?got
a
> email from the cron thing...
>
> ? ?/etc/cron.weekly/99-raid-check:
>
> ? ?WARNING: mismatch_cnt is not 0 on /dev/md10
> ? ?WARNING: mismatch_cnt is not 0 on /dev/md11
>
>
> ok, md10 and md11 are each raid1's made from 2 x 72GB scsi drives, on a
> dell 2850 or something dual single-core 3ghz server.
>
> these two md's are in turn a striped LVM volume group
>
> dmesg shows....
>
> ? ?md: syncing RAID array md10
> ? ?md: minimum _guaranteed_ reconstruction speed: 1000 KB/sec/disc.
> ? ?md: using maximum available idle IO bandwidth (but not more than
> 200000 KB/sec) for reconstruction.
> ? ?md: using 128k window, over a total of 143374656 blocks.
> ? ?md: syncing RAID array md11
> ? ?md: minimum _guaranteed_ reconstruction speed: 1000 KB/sec/disc.
> ? ?md: using maximum available idle IO bandwidth (but not more than
> 200000 KB/sec) for reconstruction.
> ? ?md: using 128k window, over a total of 143374656 blocks.
> ? ?md: md10: sync done.
> ? ?RAID1 conf printout:
> ? ? --- wd:2 rd:2
> ? ? disk 0, wo:0, o:1, dev:sdc1
> ? ? disk 1, wo:0, o:1, dev:sdd1
> ? ?md: md11: sync done.
> ? ?RAID1 conf printout:
> ? ? --- wd:2 rd:2
> ? ? disk 0, wo:0, o:1, dev:sde1
> ? ? disk 1, wo:0, o:1, dev:sdf1
>
> I'm not sure what thats telling me. ?the last thing prior to this in
> dmesg was when I added a swap to this vg last week.
>
>
> and mdadm --detail shows...
>
> # mdadm --detail /dev/md10
> /dev/md10:
> ? ? ? ?Version : 0.90
> ?Creation Time : Wed Oct ?8 12:54:48 2008
> ? ? Raid Level : raid1
> ? ? Array Size : 143374656 (136.73 GiB 146.82 GB)
> ?Used Dev Size : 143374656 (136.73 GiB 146.82 GB)
> ? Raid Devices : 2
> ?Total Devices : 2
> Preferred Minor : 10
> ? ?Persistence : Superblock is persistent
>
> ? ?Update Time : Sun Feb 28 04:53:29 2010
> ? ? ? ? ?State : clean
> ?Active Devices : 2
> Working Devices : 2
> ?Failed Devices : 0
> ?Spare Devices : 0
>
> ? ? ? ? ? UUID : b6da4dc5:c7372d6e:63f32b9c:49fa95f9
> ? ? ? ? Events : 0.84
>
> ? ?Number ? Major ? Minor ? RaidDevice State
> ? ? ? 0 ? ? ? 8 ? ? ? 33 ? ? ? ?0 ? ? ?active sync ? /dev/sdc1
> ? ? ? 1 ? ? ? 8 ? ? ? 49 ? ? ? ?1 ? ? ?active sync ? /dev/sdd1
> # mdadm --detail /dev/md11
> /dev/md11:
> ? ? ? ?Version : 0.90
> ?Creation Time : Wed Oct ?8 12:54:57 2008
> ? ? Raid Level : raid1
> ? ? Array Size : 143374656 (136.73 GiB 146.82 GB)
> ?Used Dev Size : 143374656 (136.73 GiB 146.82 GB)
> ? Raid Devices : 2
> ?Total Devices : 2
> Preferred Minor : 11
> ? ?Persistence : Superblock is persistent
>
> ? ?Update Time : Sun Feb 28 11:49:45 2010
> ? ? ? ? ?State : clean
> ?Active Devices : 2
> Working Devices : 2
> ?Failed Devices : 0
> ?Spare Devices : 0
>
> ? ? ? ? ? UUID : be475cd9:b98ee3ff:d18e668c:a5a6e06b
> ? ? ? ? Events : 0.62
>
> ? ?Number ? Major ? Minor ? RaidDevice State
> ? ? ? 0 ? ? ? 8 ? ? ? 65 ? ? ? ?0 ? ? ?active sync ? /dev/sde1
> ? ? ? 1 ? ? ? 8 ? ? ? 81 ? ? ? ?1 ? ? ?active sync ? /dev/sdf1
>
>
>
> I don't see anything wrong here ?
>
> lvm shows no problems I detect either...
>
> # vgdisplay vg1
> ?Volume group "vgdisplay" not found
> ?LV ? ? ? ? ? ? VG ? Attr ? LSize ?Origin Snap% ?Move Log Copy% ?Convert
> ?glassfish ? ? ?vg1 ?-wi-ao 10.00G
> ?lv1 ? ? ? ? ? ?vg1 ?-wi-ao 97.66G
> ?oradata ? ? ? ?vg1 ?-wi-ao 30.00G
> ?pgdata ? ? ? ? vg1 ?-wi-ao 25.00G
> ?pgdata_lss_idx vg1 ?-wi-ao 20.00G
> ?pgdata_lss_tab vg1 ?-wi-ao 20.00G
> ?swapper ? ? ? ?vg1 ?-wi-ao ?3.00G
> ?vmware ? ? ? ? vg1 ?-wi-ao 50.00G
>
>
> # pvdisplay /dev/md10 /dev/md11
> ?--- Physical volume ---
> ?PV Name ? ? ? ? ? ? ? /dev/md10
> ?VG Name ? ? ? ? ? ? ? vg1
> ?PV Size ? ? ? ? ? ? ? 136.73 GB / not usable 2.31 MB
> ?Allocatable ? ? ? ? ? yes
> ?PE Size (KByte) ? ? ? 4096
> ?Total PE ? ? ? ? ? ? ?35003
> ?Free PE ? ? ? ? ? ? ? 1998
> ?Allocated PE ? ? ? ? ?33005
> ?PV UUID ? ? ? ? ? ? ? oAgJY7-Tmf7-ac35-KoUH-15uz-Q5Ae-bmFCys
>
> ?--- Physical volume ---
> ?PV Name ? ? ? ? ? ? ? /dev/md11
> ?VG Name ? ? ? ? ? ? ? vg1
> ?PV Size ? ? ? ? ? ? ? 136.73 GB / not usable 2.31 MB
> ?Allocatable ? ? ? ? ? yes
> ?PE Size (KByte) ? ? ? 4096
> ?Total PE ? ? ? ? ? ? ?35003
> ?Free PE ? ? ? ? ? ? ? 2560
> ?Allocated PE ? ? ? ? ?32443
> ?PV UUID ? ? ? ? ? ? ? A4Qb3P-j5Lr-8ZEv-FjbC-Iczm-QkC8-bqP0zv
maybe?this?helps:?http://www.arrfab.net/blog/?p=199

--
Eero

Peter Hinse

2010-Feb-28 21:16 UTC

head link

[CentOS] puzzling md error ?

Am 28.02.2010 22:03, schrieb John R Pierce:> WARNING: mismatch_cnt is not 0 on
Have a look at http://www.arrfab.net/blog/?p=199
It says:
> A `echo repair >/sys/block/md0/md/sync_action` followed by a `echo
> check >/sys/block/md0/md/sync_action` seems to have corrected it. Now
> `cat /sys/block/md0/md/mismatch_cnt` returns 0 ?
Regards,

	Peter

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John R Pierce

2010-Feb-28 21:23 UTC

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[CentOS] puzzling md error ?

Peter Hinse wrote:> Am 28.02.2010 22:03, schrieb John R Pierce:
>   
>> WARNING: mismatch_cnt is not 0 on
>>     
>
> Have a look at http://www.arrfab.net/blog/?p=199
> It says:
>
>   
>> A `echo repair >/sys/block/md0/md/sync_action` followed by a `echo
>> check >/sys/block/md0/md/sync_action` seems to have corrected it.
Now
>> `cat /sys/block/md0/md/mismatch_cnt` returns 0 ?
>>     
Thanks.  I was trying to figure out how from the mdadm commands (UGH!) 
to do a scan.   

# cat /sys/block/md10/md/mismatch_cnt
8448
# cat /sys/block/md11/md/mismatch_cnt
7296

fugly.  Since the mirrors aren't checksummed, can i assume this means 
there's likely some data messups here?

Anyways, the repair is running on both md10 and md11, i'll check back 
with my final results...

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