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List:       linux-ide-arrays
Subject:    Older 3ware boards under RHEL (centos) 4
From:       Joshua Baker-LePain <jlb17 () duke ! edu>
Date:       2005-10-17 21:27:17
Message-ID: Pine.LNX.4.62.0510171720430.6259 () chaos ! egr ! duke ! edu
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I'm (finally) migrating my "old" 7500-8 based servers (running RH7.3 (!!) 
and XFS) to centos-4.  Rather than wedge XFS into the distro, I decided to 
migrate to ext3 (I got decent results on my 9500 based system with ext3).

The initial results are less than exciting.  The systems have 2 7500-8 
boards in hardware RAID5 with a software RAID0 stripe across 'em.  Just 
for testing, I created the stripe and formatted it like this:

[jlb@$HOST ~]$ sudo mdadm -C /dev/md0 -c 4096 -l 0 -n 2 /dev/sda3 /dev/sdb4
[jlb@$HOST ~]$ sudo mke2fs -b 4096 -j -m 0 -R stride=1024 -T largefile /dev/md0

Initial tiobench results are on the order of 180MB/s reading (OK) and 
30MB/s writing (ugh).  'blockdev --setra 16384' had very little effect on 
those numbers (upped the reads a bit, didn't touch the writes).

Any ideas?  Anybody else running a 2.6 based distro with these older 
boards?  How are you tuning 'em?

Thanks.

-- 
Joshua Baker-LePain
Department of Biomedical Engineering
Duke University

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