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

[Keith Petley <keith.petley@xxxxxxxxxx>]

Hi Pasi,

The LVM daemon you refer to is before my time at Citrix - from what I understand they found problems with it and it never progressed beyond the prototype stage.

We are currently looking at thin provisioning (again) and are currently profiling the ocfs2 clustered file system to see if it provides suitable performance as an lvm replacement.

Regards
Keith

On 07/12/12 12:49, Pasi Kärkkäinen wrote:

On Fri, Nov 30, 2012 at 10:14:52AM +0000, Dave Scott wrote:

Hey Pasi,

On Nov 30, 2012, at 10:05 AM, "Pasi Kärkkäinen" <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.

Thanks Dave!

Keith: Any insights on this? 


-- Pasi
 

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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Keith Petley
Senior Storage Development Engineer

Citrix Systems UK Ltd

Building 101 | Cambridge Science Park | Milton Road | Cambridge | CB4 0FY | UK

T: +44 (0)1223 435609

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