Re: [Xen-users] performace of disks

[Javier Guerra Giraldez <javier@xxxxxxxxxxx>]

On Thursday 24 July 2008, Grant McWilliams wrote:
> >3 - in the configuration of VM, exit one difference in performance
> >between image file (disk:/) or LVM partition (phy:/) ???
>
> I'm executing extensive lab based tests of various VM platforms and
> configurations. It won't be done for months but my
> testing of file vs. LVM disk images is nearly complete. I was expecting to
> see drastic differences in speed between the two
> but was fairly surprised that bonnie++ numbers were usually within 10% of
> each other at most. LVM overall is faster but
> not by the amount I would have expected. In half the cases the 10GB file
> was as fast as LVM. Disk IO of a VM accessing LVM
> was about another 10% off the Dom0 accessing the same LVM.

does the choice of filesystem holding the image files make any difference?

i guess ext3 would be among the best, but only if the data isn't journalled.  
also might be nice to add to the OCFS2 - GFS rivalry.

-- 
Javier

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