Re: [Xen-users] Disk performance

[Bart Coninckx <bart.coninckx@xxxxxxxxxx>]

On Saturday 03 July 2010 19:16:37 Jonathan Tripathy wrote:
> 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
> >>
> >> _______________________________________________
> >> Xen-users mailing list
> >> Xen-users@xxxxxxxxxxxxxxxxxxx
> >> http://lists.xensource.com/xen-users
> >
> > 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
> 

there is even a RPM for it

http://guichaz.free.fr/iotop/

I'm thinking of a word and it starts with "laz".

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