This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
Home Products Support Community News


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
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Delivery-date: Wed, 25 Feb 2009 11:36:51 -0800
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <61886.>
List-help: <mailto:xen-users-request@lists.xensource.com?subject=help>
List-id: Xen user discussion <xen-users.lists.xensource.com>
List-post: <mailto:xen-users@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=unsubscribe>
References: <49A40F30.9050003@xxxxxxxxxx> <49A440BA.7000609@xxxxxxxxxx> <61886.>
Sender: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
User-agent: Thunderbird (X11/20071031)
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.:


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,
Thomas Aeby, Kirchweg 52, 1735 Giffers, Switzerland
Voice : (+41)26 4180040
Internet: aeby@xxxxxxxxxx                       PGP public key available

Xen-users mailing list