Re: [Xen-users] performace of disks

[Fernando JimÃnez Solano <fernandojs@xxxxxxxxxxxxxx>]

On Thu, 24 Jul 2008 19:07:18 +0200, Victor Hugo dos Santos  
<listas.vhs@xxxxxxxxx> wrote:
> Hello,
>
> Queries:
>
> 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?

As you may know, RAID 5 is the all around performer and large stripes
give higher performance on large files.

> 3 - in the configuration of VM, exit one difference in performance
> between image file (disk:/) or LVM partition (phy:/) ???
I guess you mean file:/ instead of disk:/

They theory would say using a partition is faster, since it evades
the inherent filesystem overhead of using a file.

Experience-wise, 'tap:aio' performs better that 'file' while doing the same
job, have it a look.

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