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, Dec 07, 2012 at 05:34:45PM +0000, Keith Petley wrote:
>    Hi Pasi,
>

Hello,
 
>    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.
>

That explains why it never saw daylight..
 
>    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.
> 

Ok. Linux DM/LVM also does thin provisioning these days..

Thanks for the reply!

-- Pasi

>    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" [1]<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: [2]xen-users-bounces@xxxxxxxxxxxxxxxxxxx
>    [[3]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
> 
> References
> 
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