Re: [Xen-users] tool to test diskio

To:	Thomas Graves <tgraves@xxxxxxxxxxxxx>
Subject:	Re: [Xen-users] tool to test diskio
From:	Paras pradhan <pradhanparas@xxxxxxxxx>
Date:	Fri, 5 Feb 2010 16:09:25 -0600
Cc:	Xen Users <xen-users@xxxxxxxxxxxxxxxxxxx>
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iozone, bonnie, bonnie++ and dd seem to give consistent result if the file size is less than 100MB but it is very inconsistent if I use file size > 1GB

I don't know if this is normal.

Also wondering if there is some way to improve disk io. Right now its less than 50% than dom0.

Paras.

On Fri, Feb 5, 2010 at 4:04 PM, Thomas Graves <tgraves@xxxxxxxxxxxxx> wrote:

I was wondering the same thing. I’ve tried various ones – bonnie++, fio, etc but none of them seem to give consistent or valid results. Sometimes vms look much better then bare metal for bandwidth but then latency on the vm is terrible. Other tools show the bandwidth seems ok but latency doesn’t make sense.

Can anyone recommend a tool or method to test disk io performance and compare vm to bare metal?

Thanks,
Tom

On 2/4/10 6:00 PM, "Paras pradhan" <pradhanparas@xxxxxxxxx> wrote:

Which tool should I consider to test disk io in domU?

Thanks
Paras.

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Re: [Xen-users] tool to test diskio