Re: [Xen-users] I/O issue in xen guest OS

[Radu Rendec <radu.rendec@xxxxxxx>]

Hi,

If you have other guests that eat up CPU, perhaps your guest does not
get enough CPU to process all the data that the host is able to
transfer. What does "xm top" say about physical CPU usage?

Another possible cause may be using a slow backend for guest storage
(for instance a file over ntfs-3g mount), or the host being very busy
doing something else than I/O. This would cause lower I/O load in the
host (with more CPU load on other things), while the guest waits 100% of
the time for I/O.

Cheers,

Radu R.

On Mon, 2009-07-06 at 16:57 +0530, chandrashekar wrote:
> Hi,
> 
> I have a xen guest OS and in which I am trying to copy 3GB of file
> from one location to another(say from / to /home),at this time I/O of
> the guest OS is reaching 100% and I/O of the Domain-0 is reaching up
> to 10 to 12%.
> 
> How can I solve this issue.
> 
> Thanks,
> Chanlinux 
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> Xen-users@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users


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