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.
-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 >> > > _______________________________________________ >> > > [email protected] mailing list >> > > http://lists.freebsd.org/mailman/listinfo/freebsd-performance >> > > To unsubscribe, send any mail to >> > > "[email protected]" >> > > >> > > -- > Best regards, > Alexandr D.Sergeev > _______________________________________________ > [email protected] mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-performance > To unsubscribe, send any mail to "[email protected]" > _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-performance To unsubscribe, send any mail to "[email protected]"
