Date: Thu, 8 Apr 2010 13:14:42 -0700 From: "K. Macy" <kmacy@freebsd.org> To: "Alexandr D. Sergeev" <ales@ripn.net> Cc: freebsd-performance@freebsd.org Subject: Re: Extreme performance falling on ZFS by durable operation of a server Message-ID: <y2k82c4140e1004081314s7a44ed0g1b833dc1e8a011a7@mail.gmail.com> In-Reply-To: <20100408153257.GA35557@runo.ripn.net> References: <20100408153257.GA35557@runo.ripn.net>
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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 <ales@ripn.net> wrote: > Hi, all! > > There are problems with a server on FreeBSD 7.2 CURRENT (6 Jul 2009), car= rying out the task of mail server SMTP, IMAP. > > Messages are stored in maildirs on file system ZFS (mirror of 2 SAS 3k dr= ives). > Dovecot is used as IMAP server. > > After reboot the system works perfectly, however, somewhere in a month, a= t 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. a= nd approx. 10MBytes per sec. > > Somebody can advise, what diagnostics needed, for understanding of the re= ason of problems? > > There is an opinion that a problem with ZFS. > > Probably, it does not have enough memory. Because during the periods of o= ccurrence of a problem, =A0ARC is have less 300MB: > > vmstat -m > ... > =A0 =A0 =A0solaris 1245732 274745K =A0 =A0 =A0 - 25872717949 =A016,32,64,= 128,256,512,1024,2048,4096 > ... > > Or it is bug of ZFS implementation. > > -- > Best regards, > Alexandr D.Sergeev > _______________________________________________ > freebsd-performance@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-performance > To unsubscribe, send any mail to "freebsd-performance-unsubscribe@freebsd= .org" >
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