Date: Fri, 26 Oct 2012 19:26:48 +0200 From: "lokadamus@gmx.de" <lokadamus@gmx.de> To: Henti Smith <henti@geekware.co.za> Cc: freebsd-questions@freebsd.org Subject: Re: Strange I/O problem on Freenas 0.7.2 Message-ID: <508AC7D8.9050601@gmx.de> In-Reply-To: <CAC_HdUr%2Btz2fAnFZ8uBTLTQ8O3A5CRxxn-b_NbbS3-3jv_d0OQ@mail.gmail.com> References: <CAC_HdUr%2Btz2fAnFZ8uBTLTQ8O3A5CRxxn-b_NbbS3-3jv_d0OQ@mail.gmail.com>
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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" >
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