Re: [Xen-users] XCP storage repository using VHD on top of the LVM (FC shared too) instead of the NFS.

[Dave Scott <Dave.Scott@xxxxxxxxxxxxx>]

Hey Pasi,

On Nov 30, 2012, at 10:05 AM, "Pasi KÃrkkÃinen" <pasik@xxxxxx> wrote:

> On Wed, Mar 24, 2010 at 09:54:01PM +0000, Dave Scott wrote:
>>   Hi,
> 
> Hello Dave,
> 
>>   XCP does use VHD format on top of the LVs it creates on iSCSI/FC storage.
>>   The current problem is that it doesn't support "thin provisioning" (i.e.
>>   not pre-allocating). It's great for making snapshots and clones but not so
>>   good for space usage... as you observed!
>> 
>>   There is an early prototype of an XCP/vhd storage daemon which has an LVM
>>   implementation optimized for being able to quickly resize volumes. When
>>   that stabilizes, we'll be able to have thin provisioning. We should put
>>   the development repo for the prototype on xenbits somewhere.
> 
> Any progress on supporting thinprov on block-storage ? 

I've cc:d Keith, who is more of a storage expert than me ;-) He works on the SM 
layer used in XCP and I'm sure will have some useful insights.

Cheers,
Dave

> 
> Thanks,
> 
> -- Pasi
> 
> 
>> 
>>   Cheers,
>> 
>>   Dave
>> 
>> 
>> 
>>   From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
>>   [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Martinx -
>>   ?????
>>   Sent: 23 March 2010 20:47
>>   To: Xen List
>>   Subject: [Xen-users] XCP storage repository using VHD on top of the LVM
>>   (FC shared too) instead of the NFS.
>> 
>> 
>> 
>>   Hi!
>> 
>>    I thinking why the XCP/XenServer has an option to use the VHD format only
>>   for the NFS Servers... How to use the VHD on top of a local or shared LVM?
>> 
>>    I mean, I want to create a logical volume of 500G and within this volume,
>>   I'll create the VHDs files instead LVs for each domU.
>> 
>>    And I'll use this setup on top of my FC IBM DS4700 shared storage...
>> 
>>    It is possible?! I want the good of both worlds, the space efficient
>>   feature of the VHDs (not pre-allocating) with the speed of the local or
>>   fiber channel storage.
>> 
>>   Thanks!
>>   Thiago
> 
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> 
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