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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":
 ---------------------------------------------------------------------------=
 -----
 bash-4.2# swapinfo; df -k; zpool status
 Device          512-blocks     Used    Avail Capacity
 /dev/da0p3        16777216        0 16777216     0%
 ---------------------------------------------------------------------------=
 -----
 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
 ---------------------------------------------------------------------------=
 -----
   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
 ---------------------------------------------------------------------------=
 -----
 
 I find that as we reach maximum capacity of /ztest, zfs really starts
 bogging down. =20
 
 I'm running iozone with the following parameters:
 ---------------------------------------------------------------------------=
 -----
 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
 ---------------------------------------------------------------------------=
 -----
 
 
 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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