Re: [Xen-users] Disk performance

[Jonathan Tripathy <jonnyt@xxxxxxxxxxx>]

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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> > 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

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