From owner-freebsd-questions@FreeBSD.ORG Fri Oct 26 17:26:52 2012 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id D9927974 for ; Fri, 26 Oct 2012 17:26:52 +0000 (UTC) (envelope-from lokadamus@gmx.de) Received: from mailout-de.gmx.net (mailout-de.gmx.net [213.165.64.23]) by mx1.freebsd.org (Postfix) with SMTP id 43D178FC08 for ; Fri, 26 Oct 2012 17:26:51 +0000 (UTC) Received: (qmail invoked by alias); 26 Oct 2012 17:26:50 -0000 Received: from c137085.adsl.hansenet.de (EHLO [192.168.45.2]) [213.39.137.85] by mail.gmx.net (mp017) with SMTP; 26 Oct 2012 19:26:50 +0200 X-Authenticated: #3333826 X-Provags-ID: V01U2FsdGVkX19Z1XMJAY1ZGW8FQBUkCA7oU+WiFLGY2nIuhbosfD zsB6fZnl+En6oy Message-ID: <508AC7D8.9050601@gmx.de> Date: Fri, 26 Oct 2012 19:26:48 +0200 From: "lokadamus@gmx.de" User-Agent: Mozilla/5.0 (X11; FreeBSD i386; rv:15.0) Gecko/20120909 Thunderbird/15.0 MIME-Version: 1.0 To: Henti Smith Subject: Re: Strange I/O problem on Freenas 0.7.2 References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Y-GMX-Trusted: 0 Cc: freebsd-questions@freebsd.org X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Oct 2012 17:26:53 -0000 Freenas 0.7.2 is old. Is write cache enable? http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/configtuning-disk.html Is ZFS in use? ZFS has a value for tuning. On 22.10.2012 07:34, Henti Smith wrote: > Hi all. > > I'm having a very weird problem with a friends Freenas set-up. I'm > trying to backup his data before migrating to nas4free or just plain > FreeBSD. > > The setup is as follows: > > HP Microserver N36. > 2BG Mem (1713 MB Usable) (no swap) > 4 x 2000GB (ST2000DL003-9VT166 Seagate) drives in a graid5 setup. > > Initially he had no problems with the setup. Samba share was fine and > he populated the raid set with 3TB of data, but somewhere along the > line the disk I/O went VERY slow. > > I initially thought this might be raid related and did some tests but > actually found the problem to be on the discs. > > [root@freenas ~]# diskinfo -c /dev/ad4 > /dev/ad4 > 512 # sectorsize > 2000398934016 # mediasize in bytes (1.8T) > 3907029168 # mediasize in sectors > 3876021 # Cylinders according to firmware. > 16 # Heads according to firmware. > 63 # Sectors according to firmware. > ad:5YD2VEWQ # Disk ident. > > I/O command overhead: > time to read 10MB block 0.250736 sec = 0.012 msec/sector > time to read 20480 sectors 79.653738 sec = 3.889 msec/sector > calculated command overhead = 3.877 msec/sector > > [root@freenas ~]# diskinfo -t /dev/ad4 > /dev/ad4 > 512 # sectorsize > 2000398934016 # mediasize in bytes (1.8T) > 3907029168 # mediasize in sectors > 3876021 # Cylinders according to firmware. > 16 # Heads according to firmware. > 63 # Sectors according to firmware. > ad:5YD2VEWQ # Disk ident. > > Seek times: > Full stroke: 250 iter in 124.649884 sec = 498.600 msec > Half stroke: 250 iter in 52.112172 sec = 208.449 msec > Quarter stroke: 500 iter in 167.991252 sec = 335.983 msec > Short forward: 400 iter in 72.027133 sec = 180.068 msec > Short backward: 400 iter in 150.708625 sec = 376.772 msec > Seq outer: 2048 iter in 5.748059 sec = 2.807 msec > Seq inner: 2048 iter in 119.395823 sec = 58.299 msec > Transfer rates: > outside: 102400 kbytes in 39.207296 sec = 2612 kbytes/sec > middle: 102400 kbytes in 113.757181 sec = 900 kbytes/sec > inside: 102400 kbytes in 153.438159 sec = 667 kbytes/sec > > S.M.A.R.T. is not reporting any issues either and the speeds are > similar on all the drives. No errors in /var/log either. > > Any help or suggestions would be appreciated. > > Regards > Henti > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org" >