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Re: [Xen-users] very slow disk access

To: Brian Krusic <brian@xxxxxxxxxx>
Subject: Re: [Xen-users] very slow disk access
From: Randy Katz <rkatz@xxxxxxxxxxxxxxxxxxxxx>
Date: Sat, 26 Feb 2011 20:24:49 -0800
Cc: xen-users@xxxxxxxxxxxxxxxxxxx, "Fajar A. Nugraha" <list@xxxxxxxxx>
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On 2/26/2011 6:40 PM, Brian Krusic wrote:
On Feb 26, 2011, at 6:25 PM, Brian Krusic wrote:

On Feb 26, 2011, at 6:11 PM, Randy Katz wrote:

it seems I am using tap:aio on what appears to be quite slow:

disk = [ "tap:aio:/disk0/server3.img,xvda,w" ]

Is there a good way to convert from tap:aio to lvm?

Hi Randy,

I don't use LVM and my performance is fine.

Have you looked into the domU itself troubleshooting as if it were a non virtual host?

Things like vmstat, top, tcpdump, dstat, etc... just to get a snapshot of what your system is doing.

Apply the same approach to dom0 as well.

I've used both fixed and non fixed disk images w/o issue.

My env is Centos using the bundled version of Xen as well as Gitcos latest 3.X versions.

Hi Brian my env is the same. How do I get into dom0 to look into it? xm console Domain-0
does not work for me. Thanks,


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