Re: [Xen-users] performace of disks

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

On Thu, Jul 24, 2008 at 3:20 PM, Fernando Jiménez Solano
<fernandojs@xxxxxxxxxxxxxx> wrote:
> 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 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 ??
>
>
> 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.

ok.. ok.. ok..
is very, very clear now.

thanks.

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

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