RE: [Xen-users] Partition vs disk images

["James Harper" <james.harper@xxxxxxxxxxxxxxxx>]

> > But is there really a performance difference between LVM & file
based
> > VM's?
> >
> 
> Yes, but depending on how you use it, the effect might not be what you
> expect.
> 
> Example 1 :
> - you have 16G mem : 4G for domU, 12 G for dom0
> - 1 domU running, with 4G root filesystem
> In this scenario, you'd most likely find file-based VM perform better
> since dom0 will cache domU's root fs.

No this should not happen! Under HVM it did, and maybe still does, but
it's bad! It means that writes that DomU _thinks_ have been committed to
disk may not have been, and really bad things can happen. Do you know
for sure that file: based devices use Dom0's page cache?

James

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users