From owner-freebsd-stable@FreeBSD.ORG  Fri Feb 18 23:05:34 2011
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Date: Sat, 19 Feb 2011 02:05:33 +0300 (MSK)
From: Dmitry Morozovsky <marck@rinet.ru>
To: "Kenneth D. Merry" <ken@freebsd.org>
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Cc: freebsd-scsi@freebsd.org, stable@freebsd.org
Subject: Re: mps(4) driver (LSI 6Gb SAS) commited to stable/8
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On Fri, 18 Feb 2011, Kenneth D. Merry wrote:

KDM> > KDM> I just merged the mps(4) driver to stable/8, for those of you with LSI 6Gb
KDM> > KDM> SAS hardware.
KDM> > 
KDM> > [snip]
KDM> > 
KDM> > Again, thank you very much Ken.  I'm planning to stress test this on 846 case 
KDM> > filled with 12 (yet) WD RE4 disks organized as raidz2, and will post the 
KDM> > results.
KDM> > 
KDM> > Any hints to particularly I/O stressing patterns?  Out of my mind, I'm planning 
KDM> > multiple parallel -j'ed builds, parallel tars, *SQL benchmarks -- what else 
KDM> > could you suppose?
KDM> 
KDM> The best stress test I have found has been to just do a single sequential
KDM> write stream with ZFS.  i.e.:
KDM> 
KDM> cd /path/to/zfs/pool
KDM> dd if=/dev/zero of=foo bs=1M
KDM> 
KDM> Just let it run for a long period of time and see what happens.

Well, provided that I'm plannign to use ZFSv28 to be in place, wouldn't be 
/dev/random more appropriate?


-- 
Sincerely,
D.Marck                                     [DM5020, MCK-RIPE, DM3-RIPN]
[ FreeBSD committer:                                 marck@FreeBSD.org ]
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*** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck@rinet.ru ***
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