Re: [Xen-users] Sparse or non sparse

[Paras pradhan <pradhanparas@xxxxxxxxx>]

I am expecting.. it would be a slow growth and writing would be 1GB (max) at a time. So I think i would stick with sparse file. If I see any performance issue later on, how hard is to convert sparse to non sparse?

Thanks!

Paras.

On Wed, Jun 2, 2010 at 2:48 PM, Nick Couchman <Nick.Couchman@xxxxxxxxx> wrote:

How quickly do you expect to be filling it up, or how much data do you expect to write at one time?  If it's slow growth, performance won't be an issue.  If you expect to write several hundred GB at a time, it might be better to pre-allocate, as you'll see less I/O wait.

-Nick

>>> On 2010/06/02 at 13:46, Paras pradhan <pradhanparas@xxxxxxxxx> wrote:
> Sorry, I meant to say sparse does not perform better than non sparse.
>
> Paras.
>
>
> On Wed, Jun 2, 2010 at 2:45 PM, Paras pradhan <pradhanparas@xxxxxxxxx>wrote:
>
>> I am not worried about the space at this moment but worried about the
>> performance. I know non sparse does not perform better than spasre images
>> but don't know how much. Any rough numbers ?
>>
>> Thanks,
>> Paras.
>>
>>
>> On Wed, Jun 2, 2010 at 1:55 PM, Nick Couchman <Nick.Couchman@xxxxxxxxx>wrote:
>>
>>> That depends on how much space is available on the volume/disks that are
>>> storing this file, and how many other domUs are running there.  If there are
>>> many other domUs, or if this comes close to filling up your entire physical
>>> disk/array, this may not be a good idea, because you may overallocate your
>>> disk space and end up filling up the disk.
>>>
>>> -Nick
>>>
>>> >>> On 2010/06/02 at 09:34, Paras pradhan <pradhanparas@xxxxxxxxx> wrote:
>>> > Hi,
>>> >
>>> > Normally I use tap:aio with sparse img files to create a domUs.  I need
>>> to
>>> > add a 1TB image to one domU and expecting that it would be almost 100%
>>> full
>>> > before I extend it to 1.5TB. In this case is it safe to use sparse
>>> files?
>>> >
>>> > Thanks!
>>> > Paras.
>>>
>>>
>>>
>>>
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>>
>>




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