Hi Alexandr, - How much memory do you have?
- What are your ARC settings? 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]" > _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-performance To unsubscribe, send any mail to "[email protected]"
