Date: Wed, 3 Jul 2013 03:20:02 GMT From: Sean Bruno <sean_bruno@yahoo.com> To: freebsd-scsi@FreeBSD.org Subject: Re: kern/179932: [ciss] ciss i/o stall problem with HP Bl Gen8 (and HP Bl Gen7 + Storage Blade) Message-ID: <201307030320.r633K2eQ000255@freefall.freebsd.org>
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The following reply was made to PR kern/179932; it has been noted by GNATS.
From: Sean Bruno <sean_bruno@yahoo.com>
To: bug-followup@FreeBSD.org, philipp.maechler@hostpoint.ch
Cc:
Subject: Re: kern/179932: [ciss] ciss i/o stall problem with HP Bl Gen8
(and HP Bl Gen7 + Storage Blade)
Date: Tue, 02 Jul 2013 20:13:38 -0700
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While I wait for a p420 and p410 to test your configuration, I setup a
dl180g6 with a p400 in a test configuration. I've had some interesting
results.
I setup two disks in a RAID1+0 volume for root and swap and UFS
I created a 10 disk raidz2 volume named "ztest":
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bash-4.2# swapinfo; df -k; zpool status
Device 512-blocks Used Avail Capacity
/dev/da0p3 16777216 0 16777216 0%
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Filesystem 1024-blocks Used Avail Capacity Mounted on
/dev/da0p2 4058430 1256338 2477418 34% /
devfs 1 1 0 100% /dev
/dev/da0p4 245197222 6081304 219500142 3% /home
procfs 4 4 0 100% /proc
ztest 1118637925 67 1118637858 0% /ztest
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pool: ztest
state: ONLINE
scan: none requested
config:
NAME STATE READ WRITE CKSUM
ztest ONLINE 0 0 0
raidz2-0 ONLINE 0 0 0
da1 ONLINE 0 0 0
da2 ONLINE 0 0 0
da3 ONLINE 0 0 0
da4 ONLINE 0 0 0
da5 ONLINE 0 0 0
da6 ONLINE 0 0 0
da7 ONLINE 0 0 0
da8 ONLINE 0 0 0
da9 ONLINE 0 0 0
da10 ONLINE 0 0 0
errors: No known data errors
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I find that as we reach maximum capacity of /ztest, zfs really starts
bogging down. =20
I'm running iozone with the following parameters:
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iozone -s 50G -r 256K -+q 30 -i 0 -i 1 -R -t 12
-F /ztest/1 /ztest/2 /ztest/3 /ztest/4 /ztest/5 /ztest/6 /ztest/7 /ztest/8 =
/ztest/9 /ztest/10 /ztest/11 /ztest/12
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This would be a good start to more reliably test your configuration. I
didn't bother doing gpt partitions and the geom partitioning scheme in
this configuration because its not bootable.
Sean
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