Terrible disk performance with LSI / FreeBSD 9.2-RC1
jamesgosnell at gmail.com
Wed Aug 7 19:15:50 UTC 2013
Maybe one of your drives is bad, so it's constantly doing error correction?
On Tue, Aug 6, 2013 at 9:48 PM, J David <j.david.lists at gmail.com> wrote:
> We have a machine running 9.2-RC1 that's getting terrible disk I/O
> performance. Its performance has always been pretty bad, but it
> didn't really become clear how bad until we did a zpool replace on one
> of the drives and realized it was going to take 3 weeks to rebuild a
> <1TB drive.
> The hardware specs are:
> - 2 x Xeon L5420
> - 32 GiB RAM
> - LSI Logic SAS 1068E
> - 2 x 32GB SSD's
> - 6 x 1TB Western Digital RE3 7200RPM SATA
> The LSI controller has the most recent firmware I'm aware of
> (6.36.00.00 / 1.33.00.00 dated 2011.08.24), is in IT mode, and appears
> to be working fine:
> mpt0 Adapter:
> Board Name: USASLP-L8i
> Board Assembly: USASLP-L8i
> Chip Name: C1068E
> Chip Revision: B3
> RAID Levels: none
> mpt0 Configuration: 0 volumes, 8 drives
> drive da0 (30G) ONLINE <FTM32GL25H 10> SATA
> drive da1 (29G) ONLINE <SSDSA2SH032G1GN 8860> SATA
> drive da2 (931G) ONLINE <WDC WD1002FBYS-0 0C05> SATA
> drive da3 (931G) ONLINE <WDC WD1002FBYS-0 0C05> SATA
> drive da4 (931G) ONLINE <WDC WD1002FBYS-0 0C05> SATA
> drive da5 (931G) ONLINE <WDC WD1002FBYS-0 0C05> SATA
> drive da6 (931G) ONLINE <WDC WD1002FBYS-0 0C05> SATA
> drive da7 (931G) ONLINE <WDC WD1002FBYS-0 0C05> SATA
> The eight drives are configured as ZIL, L2ARC on SSD and a six drive
> raidz2 on the spinning disks.
> We did a ZFS replace on the last drive in the line, and the resilver
> is proceeding at less than 800k/sec.
> extended device statistics
> device r/s w/s kr/s kw/s qlen svc_t %b
> da0 0.0 0.0 0.0 0.1 0 0.9 0
> da1 0.0 8.2 0.0 19.9 0 0.1 0
> da2 125.6 23.0 768.2 40.5 4 33.0 88
> da3 126.6 23.1 769.0 41.3 4 32.3 89
> da4 126.0 24.0 768.5 42.7 4 32.1 88
> da5 125.9 22.0 768.2 40.1 4 31.6 87
> da6 124.0 22.0 766.6 39.9 5 31.4 84
> da7 0.0 136.9 0.0 801.3 0 0.6 4
> The system has plenty of free RAM, is 99.7% idle, has nothing else
> going on, and runs like a one-legged dog.
> There are no error messages or any sign of a problem anywhere, other
> than the really terrible performance. (When not rebuilding, it does
> light NFS duty. That performance is similarly bad, but has never
> really mattered.)
> Similar systems running Solaris put out 10x these numbers claiming 30%
> busy instead of 90% busy.
> Does anyone have any suggestions for how I could troubleshoot this
> further? At this point, I'm kind of at a loss as to where to go from
> here. My goal is to try to phase out the Solaris machines, but this
> is kind of a roadblock.
> Thanks for any advice!
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James Gosnell, ACP
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