Re: [Xen-users] performace of disks

[Fernando JimÃnez Solano <fernandojs@xxxxxxxxxxxxxx>]

On Thu, 24 Jul 2008 20:49:49 +0200, Victor Hugo dos Santos  
<listas.vhs@xxxxxxxxx> wrote:
> On Thu, Jul 24, 2008 at 1:39 PM, Fernando JimÃnez Solano
> <fernandojs@xxxxxxxxxxxxxx> wrote:
> > On Thu, 24 Jul 2008 19:07:18 +0200, Victor Hugo dos Santos
> > <listas.vhs@xxxxxxxxx> wrote:
> [...]
>
> > > 1 - what is the best RAID (0,1,5,10,50) for server running very, very
> > > VM instances ???
> > > 2 - and config of stripes/element sizes (32, 64, 128, 256, etc, KB) ??
> > I guess it depends more on the kind of disk activity of the VMs rather  
> > than
> > the number of VMs. Database server? Desktop? Media streamer?
> mmmm.. mmmm.. and mmmm
> but.. all virtual disks aren't one big image for Dom0 ???
> in other words, this type of data in the virtual disks is relevant ??

It's not the file or data itself but how the data is accessed. Large  
stripes
tend to perform better on large files because large files are usually read  
in
a sequential, non latency-critical manner. This isn't true for images,  
they're
accessed just like the underlying filesystem is (with some overhead). That  
is,
rather randomly.








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