From: Louis-David Mitterrand <vindex+lists-linux-scsi@apartia.org>
To: linux-scsi@vger.kernel.org
Subject: caviar black + mpt2sas horrific performance
Date: Wed, 30 Mar 2011 10:01:18 +0200 [thread overview]
Message-ID: <20110330080114.GA5066@apartia.fr> (raw)
Hi,
I am seeing horrific performance on a Dell T610 with a LSISAS2008 (Dell
H200) card and 8 WD1002FAEX Caviar Black 1TB configured in mdadm raid6.
The LSI card is upgraded to the latest 9.00 firmware:
http://www.lsi.com/storage_home/products_home/host_bus_adapters/sas_hbas/internal/sas9211-8i/index.html
and the 2.6.38.2 kernel uses the newer mpt2sas driver.
On the T610 this command takes 20 minutes:
tar -I pbzip2 -xvf linux-2.6.37.tar.bz2 22.64s user 3.34s system 2% cpu 20:00.69 total
where on a lower spec'ed Poweredge 2900 III server (LSI Logic MegaRAID
SAS 1078 + 8 x Hitachi Ultrastar 7K1000 in mdadm raid6) it takes 22
_seconds_:
tar -I pbzip2 -xvf linux-2.6.37.tar.bz2 16.40s user 3.22s system 86% cpu 22.773 total
Besides hardware, the other difference between servers is that the
PE2900's MegaRAID has no JBOD mode so each disk must be configured as a
"raid0" vdisk unit. On the T610 no configuration was necessary for the
disks to "appear" in the OS. Would configuring them as raid0 vdisks
change anything?
Thanks in advance for any suggestion,
next reply other threads:[~2011-03-30 8:10 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-30 8:01 Louis-David Mitterrand [this message]
[not found] ` <4565AEA676113A449269C2F3A549520F8086471A@cosmail03.lsi.com>
2011-03-30 20:17 ` caviar black + mpt2sas horrific performance Louis-David Mitterrand
2011-03-31 15:07 ` Moore, Eric
2011-03-31 15:34 ` Louis-David Mitterrand
2011-04-02 4:51 ` Moore, Eric
2011-04-03 17:35 ` Douglas Gilbert
2011-04-03 23:05 ` Moore, Eric
2011-04-29 14:06 ` Louis-David Mitterrand
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