Re: [Xen-users] performace of disks

["Victor Hugo dos Santos" <listas.vhs@xxxxxxxxx>]

On Thu, Jul 24, 2008 at 1:39 PM, Fernando Jiménez 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 ??


> 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.

sorry.. this correct is file:/ not disk:/

thanks

-- 
-- 
Victor Hugo dos Santos
Linux Counter #224399

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