K. Macy пишет:
8-STABLE is definitely better, but you should also set arc_min to at
least 384M-512M. I'm not sure that arc_min is even honored under 7.2.
Thanks for advice!
And I also not sure, because now settings is:
vfs.zfs.arc_min: 1073741824
vfs.zfs.arc_max: 1610612736
but vmstat -m shows:
solaris 1098941 622231K - 6443745881 16,32,64,128,256,512,1024,2048,4096
-Kip
On Mon, Apr 12, 2010 at 2:11 AM, Alexandr D. Sergeev <[email protected]> wrote:
Whether there are any ideas about the reasons of such problems?
Whether transition to FreeBSD 8.0 RELEASE / STABLE can help?
ZFS in it is declared as "bug free"
On Fri, Apr 09, 2010 at 06:44:09AM +0400, Alexandr D. Sergeev wrote:
On Thu, Apr 08, 2010 at 01:14:42PM -0700, K. Macy wrote:
Hi Alexandr,
Hi Kip,
- How much memory do you have?
4Gb.
Applications consume a lot of memory, is partially used swap (~1Gb, but without
active i/o).
We have planned increase in memory to 16G
- What are your ARC settings?
Settings is default, that recommended for amd64 kernel.
But I am not assured that it is optimal.
Thus sysctl variables are automatically sets to:
vfs.zfs.arc_max ~800Mb
vfs.zfs.arc_mim ~128Mb
Now the next reboot was required.
Together with which following settings have been made:
vm.kmem_size=2048M
vfs.zfs.arc_max=1536M
vfs.zfs.arc_min=1024M
vfs.zfs.vdev.cache.size=64M
Let's look, as it will affect.
However there is confidence that no problem at a size of ARC.
Even at 200Mb ARC, productivity should not fall so strongly.
Thanks,
Kip
On Thu, Apr 8, 2010 at 8:32 AM, Alexandr D. Sergeev <[email protected]> wrote:
Hi, all!
There are problems with a server on FreeBSD 7.2 CURRENT (6 Jul 2009), carrying
out the task of mail server SMTP, IMAP.
Messages are stored in maildirs on file system ZFS (mirror of 2 SAS 3k drives).
Dovecot is used as IMAP server.
After reboot the system works perfectly, however, somewhere in a month, at the
same load, arise periodic long delays at opening of new letters.
Judging by output iostat -x -w 1, during these moments the disk subsystem is
strongly loaded.
%busy disks comes nearer to 100 %. Readings nearby 300 per sec prevail. and
approx. 10MBytes per sec.
Somebody can advise, what diagnostics needed, for understanding of the reason
of problems?
There is an opinion that a problem with ZFS.
Probably, it does not have enough memory. Because during the periods of
occurrence of a problem, ARC is have less 300MB:
vmstat -m
...
solaris 1245732 274745K - 25872717949
16,32,64,128,256,512,1024,2048,4096
...
Or it is bug of ZFS implementation.
--
Best regards,
Alexandr D.Sergeev
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--
Best regards,
Alexandr D.Sergeev
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--
Best regards,
Alexandr D.Sergeev
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