Displaying 20 results from an estimated 7000 matches similar to: "SSD erase state and reducing SSD wear"
2012 May 17
6
SSD format/mount parameters questions
For using SSDs:
Are there any format/mount parameters that should be set for using btrfs
on SSDs (other than the "ssd" mount option)?
General questions:
How long is the ''delay'' for the delayed alloc?
Are file allocations aligned to 4kiB boundaries, or larger?
What byte value is used to pad unused space?
(Aside: For some, the erased state reads all 0x00, and for
2010 Jun 19
6
does sharing an SSD as slog and l2arc reduces its life span?
Hi,
I don''t know if it''s already been discussed here, but while
thinking about using the OCZ Vertex 2 Pro SSD (which according
to spec page has supercaps built in) as a shared slog and L2ARC
device it stroke me that this might not be a such a good idea.
Because this SSD is MLC based, write cycles are an issue here,
though I can''t find any number in their spec.
Why do I
2010 Jun 12
5
program in Wine doesnt see SATA solid state drive
I have a 50 gig OCZ Vertex LE drive that needs a firmware update.
When I run the Windows only flash program in wine it doesnt see the SATA ssd drive it needs to flash.
I have booted off another hard disk.
I need administrator privileges to see the drive so I config'd wine for win98.
I also tried to manually add the drive in wine config by adding the /media/xxxx path and also manually
2010 May 24
16
questions about zil
I recently got a new SSD (ocz vertex LE 50gb)
It seems to work really well as a ZIL performance wise. My question is, how
safe is it? I know it doesn''t have a supercap so lets'' say dataloss
occurs....is it just dataloss or is it pool loss?
also, does the fact that i have a UPS matter?
the numbers i''m seeing are really nice....these are some nfs tar times
before
2010 Oct 06
14
Bursty writes - why?
I have a 24 x 1TB system being used as an NFS file server. Seagate SAS disks connected via an LSI 9211-8i SAS controller, disk layout 2 x 11 disk RAIDZ2 + 2 spares. I am using 2 x DDR Drive X1s as the ZIL. When we write anything to it, the writes are always very bursty like this:
ool 488K 20.0T 0 0 0 0
xpool 488K 20.0T 0 0 0 0
xpool
2010 Jun 25
13
OCZ Vertex 2 Pro performance numbers
Now the test for the Vertex 2 Pro. This was fun.
For more explanation please see the thread "Crucial RealSSD C300 and cache
flush?"
This time I made sure the device is attached via 3GBit SATA. This is also
only a short test. I''ll retest after some weeks of usage.
cache enabled, 32 buffers, 64k blocks
linear write, random data: 96 MB/s
linear read, random data: 206 MB/s
linear
2010 Aug 03
2
When is the L2ARC refreshed if on a separate drive?
I''m running a mirrored pair of 2 TB SATA drives as my data storage drives on my home workstation, a Core i7-based machine with 10 GB of RAM. I recently added a sandforce-based 60 GB SSD (OCZ Vertex 2, NOT the pro version) as an L2ARC to the single mirrored pair. I''m running B134, with ZFS pool version 22, with dedup enabled. If I understand correctly, the dedup table should be in
2011 Dec 28
13
fstrim on BTRFS
Hi!
With 3.2-rc4 (probably earlier), Ext4 seems to remember what areas it
trimmed:
merkaba:~> fstrim -v /boot
/boot: 224657408 bytes were trimmed
merkaba:~> fstrim -v /boot
/boot: 0 bytes were trimmed
But BTRFS does not:
merkaba:~> fstrim -v /
/: 4431613952 bytes were trimmed
merkaba:~> fstrim -v /
/: 4341846016 bytes were trimmed
Is it planned to add this feature to BTRFS
2013 Jul 09
2
OCZ Vertex4 quirks
Same as its brothers/sisters, it's optimized for 4 KB blocks.
/*
* OCZ Vertex 4 SSDs
* 4k optimized
*/
{ T_DIRECT, SIP_MEDIA_FIXED, "ATA", "OCZ_VERTEX4*", "*"},
/*quirks/DA_Q_4K
Borja.
2012 Oct 03
1
OCZ Vertex3 SSD and LSI 9211-8i (mpt2sas)
I have a couple development servers running centos 6.3 64bit that have
LSI 9211-8i SAS2 controllers connected to a SAS2 backplane. these
work fine with SATA hard disks (populated with a bunch of 3TB SATA
drives)...
I'm trying to install a OCZ Vertex3 SSD on each of the two servers to do
some ssd caching tests... system sees the drive, so I do the following...
# parted -a min
2010 Feb 12
13
SSD and ZFS
Hi all,
just after sending a message to sunmanagers I realized that my question
should rather have gone here. So sunmanagers please excus ethe double
post:
I have inherited a X4140 (8 SAS slots) and have just setup the system
with Solaris 10 09. I first setup the system on a mirrored pool over
the first two disks
pool: rpool
state: ONLINE
scrub: none requested
config:
NAME
2012 Oct 01
3
Best way to measure performance of ZIL
Hi all,
I currently have a OCZ Vertex 4 SSD as a ZIL device and am well aware of
their exaggerated claims of sustained performance. I was thinking about
getting a DRAM based ZIL accelerator such as Christopher George''s DDRDive,
one of the STEC products, etc. Of course the key question i''m trying to
answer is: is the price premium worth it?
--- What is the (average/min/max)
2012 Nov 14
3
SSD ZIL/L2ARC partitioning
Hi,
I''ve ordered a new server with:
- 4x600GB Toshiba 10K SAS2 Disks
- 2x100GB OCZ DENEVA 2R SYNC eMLC SATA (no expander so I hope no SAS/
SATA problems). Specs: http://www.oczenterprise.com/ssd-products/deneva-2-r-sata-6g-2.5-emlc.html
I want to use the 2 OCZ SSDs as mirrored intent log devices, but as
the intent log needs quite a small amount of the disks (10GB?), I was
wondering
2011 May 20
3
SSD for Centos SWAP /tmp & /var/ partition
Has anyone actually used a SSD in a Centos setup?
My little experiment with a s/h WD drive for /tmp and SWAP
partitions kicked the bucket on Wednesday, when the poor WD
drive caught the click-of-death. It was a s/h drive
to start with and lasted about 4 months. But that was
without the /var/log/ partition being written to it, as I
mounted that back onto /var/log from the original drive.
So
2011 Apr 09
3
Converting edgelist to symmetric matrix
Hi,
I have network data in the form of a couple of edgelists containing weights in
the format "x,y,weight" whereby x represents row header and y represents column
header. All edgelists are based on links among 634 nodes and I need to convert
them into a 634*634 weighted matrix.
I searched for online help using possible keywords I know, but I could not find
a clue how to do this in
2016 Mar 11
2
/etc/msg.sock folder questions regarding nvram/wear leveling.
Hi,
i try to create a openWRT Samba 4.3 package and stumbled across the fact
that samba 4.3 will create those message socks inside the private-dir. That
results in creating entries inside /etc/samba/msg.sock.
On openWRT /var is a tempFS in ram, so anything there is not a problem
regarding nvram and wear leveling. Yet the root uses a jffs2 overlay. So
while those message socks have no size, jffs2
2014 Oct 08
3
CF Card wear optimalisation for ext4
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Hello everyone,
I been using CF cards for almost more then 7 years now with ext
file-system without any major problems on ALIX boards.
Last year I took 30 other systems in production with ext4 and the CF
cards been dropping out pretty fast, it may have been a bad batch but
I do want to look at it. I don't think the devices writes a lot of IO
(is
2012 Aug 03
1
Guest disk (LVM on SSD) too slow. Xen unstable, DomU-win XP sp2
nice time, Xen community.
my DomU has very slow Disk performance, despite the usage of SSD''s. Maybe somebody can give some good tips to accelerate, or point out my mistakes.
DomU CristalDiskMark 3.0.1 test(roundet):
seq (R/W) :71 / 86 MB/s
512k(R/W) :76 / 80 MB/s
4K(R/W) :4 / 3 MB/s
4K QD32(R/W):4 / 4 MB/s
The same guest running in KVM-Qemu (standard installed on Ubuntu
2014 Oct 10
0
Re: CF Card wear optimalisation for ext4
On Oct 8, 2014, at 10:28 AM, Jelle de Jong <jelledejong at powercraft.nl> wrote:
> Hello everyone,
>
> I been using CF cards for almost more then 7 years now with ext
> file-system without any major problems on ALIX boards.
>
> Last year I took 30 other systems in production with ext4 and the CF
> cards been dropping out pretty fast, it may have been a bad batch but
2008 Sep 10
7
Intel M-series SSD
Interesting flash technology overview and SSD review here:
http://www.anandtech.com/cpuchipsets/intel/showdoc.aspx?i=3403
and another review here:
http://www.tomshardware.com/reviews/Intel-x25-m-SSD,2012.html
Regards,
--
Al Hopper Logical Approach Inc,Plano,TX al at logical-approach.com
Voice: 972.379.2133 Timezone: US CDT
OpenSolaris Governing Board (OGB) Member - Apr 2005