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Re: [Xen-users] Disk performance

To: Bart Coninckx <bart.coninckx@xxxxxxxxxx>, Xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] Disk performance
From: Jonathan Tripathy <jonnyt@xxxxxxxxxxx>
Date: Sat, 03 Jul 2010 18:16:37 +0100
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On 03/07/10 15:43, Bart Coninckx wrote:
On Saturday 03 July 2010 15:17:13 Jonathan Tripathy wrote:
Hi Everyone,

My Xen host has 2 X 1TB hard drives in a RAID1 setup. If one DomU starts
to dd a 5GB file (A ran it in a loop as a test), access ssh on the other
DomU becomes very slow.

Is this normal?

Many Thanks

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I think this can be expected with things like a dd which could hog the disk
bandwidth. Do a bonnie++ benchmark to see what the disk can do and then do a
iotop while you are doing the dd and you will see how much is consumed and how
much is left for the other DomUs.

B.

I'm using centos as my Dom0. iotop doesn't seem to be available for Centos, and I don't think my kernel has the correct modules for dstat to work in a similar manner to iotop. Any other ideas? Could I just run iotop in a Ubuntu DomU? Would that give me correct results?

Thanks

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