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

[Pasi Kärkkäinen <pasik@xxxxxx>]

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
> > 
> >> _______________________________________________
> >> Xen-users mailing list
> >> Xen-users@xxxxxxxxxxxxxxxxxxx
> >> http://lists.xensource.com/xen-users
> > 

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