Hey,
Sorry for this revisiting this thread late. What exactly is sync writes ? Do
you mean synchronous writes or a app calling fsync() after every write ?
TIA
Dushyanth
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From: Richard Elling
To: Dushyanth
Cc: zfs-discuss@opensolaris.org
Subject: Re: [zfs-discuss] ZFS ZIL/log on SSD weirdness
Sent: Nov 18, 2009 21:55
On Nov 18, 2009, at 2:20 AM, Dushyanth wrote:
Just to clarify : Does iSCSI traffic from a Solaris iSCSI initiator
to a third party target go through
Darren J Moffat wrote:
Meilicke wrote:
I second the use of zilstat - very useful, especially if you don't want to mess
around with adding a log device and then having to destroy the pool if you don't
want the log device any longer.
log devices can be removed as of zpool version 19.
no
On Nov 19, 2009, at 10:28 AM, Dushyanth Harinath wrote:
Thanks a lot. This clears many of the doubts I had.
I was actually trying to improve the performance of our email
storage. We are using dovecot as the LDA on a set of RHEL boxes and
the email volume seems to be saturating the write
Hi,
Thanks for all the inputs. I did run some postmark tests without slog and with
it and did not see any performance benefits on the iSCSI volume.
I will repeat them again and post results here.
Also pls note that the solarix box is the initiator and the target is a
Infortrend S16-R1130
the SSD's black-box-filesystem is fragmented?
Not very sure - Its a Transcend TS8GSSD25S 2.5 SLC SDD that i could find in
our store immdtly. I also have a ACARD ANS-9010 DRAM (http://bit.ly/3cQ4fK)
that iam experimenting with.
The Intel X25e should arrive soon. Are there any other
Just to clarify : Does iSCSI traffic from a Solaris iSCSI initiator to a third
party target go through ZIL ?
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On Nov 18, 2009, at 2:20 AM, Dushyanth wrote:
Just to clarify : Does iSCSI traffic from a Solaris iSCSI initiator
to a third party target go through ZIL ?
ZFS doesn't know what a block device is. So if you configure your pool
to use iSCSI devices, then it will use them.
To measure ZIL
I second the use of zilstat - very useful, especially if you don't want to mess
around with adding a log device and then having to destroy the pool if you
don't want the log device any longer.
On Nov 18, 2009, at 2:20 AM, Dushyanth wrote:
Just to clarify : Does iSCSI traffic from a Solaris
Scott Meilicke wrote:
I second the use of zilstat - very useful, especially if you don't want to mess
around with adding a log device and then having to destroy the pool if you
don't want the log device any longer.
log devices can be removed as of zpool version 19.
--
Darren J Moffat
Hey guys,
Iam new to ZFS and have been playing around since few days. Iam trying to
improve performance of a iSCSI storage backend by putting the ZIL/log on a SSD.
Below are the steps i followed
# format /dev/null
Searching for disks...
The device does not support mode page 3 or page 4,
or
On 18/11/2009, at 7:33 AM, Dushyanth wrote:
Now when i run dd and create a big file on /iftraid0/fs and watch `iostat
-xnz 2` i dont see any stats for c8t4d0 nor does the write performance
improves.
I have not formatted either c9t9d0 or c8t4d0. What am i missing ?
Last I checked, iSCSI
Which OS and release? The behaviour has changed over time.
-- richard
On Nov 17, 2009, at 1:33 PM, Dushyanth wrote:
Hey guys,
Iam new to ZFS and have been playing around since few days. Iam
trying to improve performance of a iSCSI storage backend by putting
the ZIL/log on a SSD.
Below
Oops - most important info missed - Its OpenSolaris 2009.06
# uname -a
SunOS m1-sv-ZFS-1 5.11 snv_111b i86pc i386 i86pc Solaris
TIA
Dushyanth
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I ran a quick test to confirm James theory - and there is more weirdness
# Mirror pool with two 500GB SATA disks - no log device
r...@m1-sv-zfs-1:~# zpool create pool1 mirror c8t5d0 c8t2d0
r...@m1-sv-zfs-1:~# zfs create pool1/fs
r...@m1-sv-zfs-1:~# cd /pool1/fs
r...@m1-sv-zfs-1:/pool1/fs# time
I am sorry that I don't have any links, but here is what I observe on my
system. dd does not do sync writes, so the ZIL is not used. iSCSI traffic does
sync writes (as of 2009.06, but not 2008.05), so if you repeat your test using
an iSCSI target from your system, you should see log activity.
On Nov 17, 2009, at 2:50 PM, Scott Meilicke wrote:
I am sorry that I don't have any links, but here is what I observe
on my system. dd does not do sync writes, so the ZIL is not used.
iSCSI traffic does sync writes (as of 2009.06, but not 2008.05), so
if you repeat your test using an iSCSI
d == Dushyanth dushyant...@directi.com writes:
d Performance dropped for some reason
the SSD's black-box-filesystem is fragmented? Do the slog-less test
again and see if it's still fast.
pgpQ5Pzv39hs6.pgp
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