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Re: [Xen-users] RESOLVED: bad I/O performance with HP Smart Array RAID

To: Timh B <timh@xxxxxxxxxxxxxxxx>
Subject: Re: [Xen-users] RESOLVED: bad I/O performance with HP Smart Array RAID
From: Thomas Aeby <aeby@xxxxxxxxxx>
Date: Wed, 25 Feb 2009 20:36:02 +0100
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Timh B wrote:
We are actually running quite a few hp servers with their E200i/p and 400P
controllers and overall im happy with the performance ( this is debian
etch, not really xen related) though we do have the BBWC module on all the
servers, and write up to 250-300MB,2k iops+

That's great and it sounds promising. I'm not very eager to install BBWC since I saw quite a few posts stating that even with BBWC installed (and write cache enabled) they get a really poor throughput, i.e.:

http://forums11.itrc.hp.com/service/forums/questionanswer.do?admit=109447626+1235589954133+28353475&threadId=1188496

Maybe this does not apply to SAS disks - I'm not sure. Are you running the controller with SAS disks?

Unfortunately I haven't been able to enable the drives internal write cache so far.

Best regards,
Tom
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