From owner-freebsd-performance@FreeBSD.ORG Thu Apr 8 20:44:13 2010 Return-Path: Delivered-To: freebsd-performance@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id AEF6D1065677 for ; Thu, 8 Apr 2010 20:44:13 +0000 (UTC) (envelope-from kmatthew.macy@gmail.com) Received: from qw-out-2122.google.com (qw-out-2122.google.com [74.125.92.27]) by mx1.freebsd.org (Postfix) with ESMTP id 64C7F8FC12 for ; Thu, 8 Apr 2010 20:44:13 +0000 (UTC) Received: by qw-out-2122.google.com with SMTP id 5so819941qwi.7 for ; Thu, 08 Apr 2010 13:44:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:sender:reply-to:received :in-reply-to:references:date:x-google-sender-auth:received :message-id:subject:from:to:cc:content-type :content-transfer-encoding; bh=MN6k6kzPwdY8JSjXURB344/1iLU+MDhaxrL9Rh3wf8Y=; b=JgoBfQ7ZFuNID9XAl7+jJedk+3qUbM6Ddp93We6s6e9gzf6OI8IPGmXm9Bz93rho9H Kx1Bo/I6Ou98pKT9sw4CJUugy190sCY9Uy1GtPnxxEstBTWmnn8TmIGyrzbJCP7BAMcm ZHR0XI0qGqHQ9gSvJn4mJKwKVIAoRyC3goKG4= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:sender:reply-to:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:cc:content-type :content-transfer-encoding; b=eieVt/q8NPpzI7AHAVGkV9ghQXRANvqxhXIoKxpDvP+pCm7s9Qv31d6eGmVnD8uuTI A+z6S5hr5l/0u2aX7iYhmrs3ee9kYMs/dG+1OtM3C5LHtvCm+tK9z163/fO44GRAH+Eb 697UZ+GJ4kDSQSOSO6PIPz+X/cc/gkN1/i5t8= MIME-Version: 1.0 Sender: kmatthew.macy@gmail.com Received: by 10.229.214.136 with HTTP; Thu, 8 Apr 2010 13:14:42 -0700 (PDT) In-Reply-To: <20100408153257.GA35557@runo.ripn.net> References: <20100408153257.GA35557@runo.ripn.net> Date: Thu, 8 Apr 2010 13:14:42 -0700 X-Google-Sender-Auth: 5ed291a372e074b7 Received: by 10.229.212.213 with SMTP id gt21mr1007980qcb.2.1270757682200; Thu, 08 Apr 2010 13:14:42 -0700 (PDT) Message-ID: From: "K. Macy" To: "Alexandr D. Sergeev" Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Cc: freebsd-performance@freebsd.org Subject: Re: Extreme performance falling on ZFS by durable operation of a server X-BeenThere: freebsd-performance@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: kmacy@freebsd.org List-Id: Performance/tuning List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 08 Apr 2010 20:44:13 -0000 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 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" >