migration and snapshots.

migration and snapshots.

[J Nb]

What would be a good storage topology for allowing for migration as well as support snapshots (for backup)

Would love to hear recommendations as well as details on setup that people are using. (I am assuming that this is possible.)

Here is my current understanding..

LVM -- Snapshots but not shared.
CLVM -- shared but no snapshots. (yet)
NFS/GFS -- Shared FS but no snapshots 


qcow2 files and VHD file supports snapshots... but VHD is not yet available in Xen or KVM.

qcow2 : are people using this in production ? Any limitations.. any success stories ?

qcow2 takes snapshots within the disk it self... how can I get the snapshot out for backup ?

-nb



      

Re: migration and snapshots.

[Pasi Kärkkäinen]

On Wed, Dec 30, 2009 at 10:55:34AM -0800, J Nb wrote:
> What would be a good storage topology for allowing for migration as well as support snapshots (for backup)
> 
> Would love to hear recommendations as well as details on setup that people are using. (I am assuming that this is possible.)
> 
> Here is my current understanding..
> 
> LVM -- Snapshots but not shared.
> CLVM -- shared but no snapshots. (yet)
> NFS/GFS -- Shared FS but no snapshots 
> 
> 
> qcow2 files and VHD file supports snapshots... but VHD is not yet available in Xen or KVM.
> 

blktap2 backend in Xen supports VHD.

See: http://markmail.org/message/dqcil5uyigwlk2sr

-- Pasi

Re: migration and snapshots.

[J Nb]

Thanks.

It seems this is post 3.4 release.. any plans on getting these for older version ? (may be a question for xen-devel forum.)

What about KVM ? Is there a plan to get this in to qemu / kvm ? Also, make it available to older versions of qemu/kvm.

Just trying to see how this important feature can be used by people currently (which are using xen and kvm from their distros.)

-nb


--- On Fri, 1/1/10, Pasi Kärkkäinen <pasik@iki.fi> wrote:

> From: Pasi Kärkkäinen <pasik@iki.fi>
> Subject: Re: migration and snapshots.
> To: "J Nb" <j_nwb@yahoo.com>
> Cc: "kvm" <kvm@vger.kernel.org>
> Date: Friday, January 1, 2010, 9:12 AM
> On Wed, Dec 30, 2009 at 10:55:34AM
> -0800, J Nb wrote:
> > What would be a good storage topology for allowing for
> migration as well as support snapshots (for backup)
> > 
> > Would love to hear recommendations as well as details
> on setup that people are using. (I am assuming that this is
> possible.)
> > 
> > Here is my current understanding..
> > 
> > LVM -- Snapshots but not shared.
> > CLVM -- shared but no snapshots. (yet)
> > NFS/GFS -- Shared FS but no snapshots 
> > 
> > 
> > qcow2 files and VHD file supports snapshots... but VHD
> is not yet available in Xen or KVM.
> > 
> 
> blktap2 backend in Xen supports VHD.
> 
> See: http://markmail.org/message/dqcil5uyigwlk2sr
> 
> -- Pasi
> 
> 


      

Re: migration and snapshots.

[Pasi Kärkkäinen]

On Sat, Jan 02, 2010 at 03:40:01PM -0800, J Nb wrote:
> Thanks.
> 
> It seems this is post 3.4 release.. any plans on getting these for older version ? (may be a question for xen-devel forum.)
> 

Yeah, blktap2 is only in xen-unstable.hg, not in xen-3.4-testing.hg. 
blktap2 will be part of upcoming Xen 4.0 release.

I believe the patches should apply to xen 3.4 aswell:
http://markmail.org/message/dqcil5uyigwlk2sr#query:+page:1+mid:ihjbbiicmegssg5v+state:results

-- Pasi

> What about KVM ? Is there a plan to get this in to qemu / kvm ? Also, make it available to older versions of qemu/kvm.
> 
> Just trying to see how this important feature can be used by people currently (which are using xen and kvm from their distros.)
> 
> -nb
> 
> 
> --- On Fri, 1/1/10, Pasi Kärkkäinen <pasik@iki.fi> wrote:
> 
> > From: Pasi Kärkkäinen <pasik@iki.fi>
> > Subject: Re: migration and snapshots.
> > To: "J Nb" <j_nwb@yahoo.com>
> > Cc: "kvm" <kvm@vger.kernel.org>
> > Date: Friday, January 1, 2010, 9:12 AM
> > On Wed, Dec 30, 2009 at 10:55:34AM
> > -0800, J Nb wrote:
> > > What would be a good storage topology for allowing for
> > migration as well as support snapshots (for backup)
> > > 
> > > Would love to hear recommendations as well as details
> > on setup that people are using. (I am assuming that this is
> > possible.)
> > > 
> > > Here is my current understanding..
> > > 
> > > LVM -- Snapshots but not shared.
> > > CLVM -- shared but no snapshots. (yet)
> > > NFS/GFS -- Shared FS but no snapshots 
> > > 
> > > 
> > > qcow2 files and VHD file supports snapshots... but VHD
> > is not yet available in Xen or KVM.
> > > 
> > 
> > blktap2 backend in Xen supports VHD.
> > 
> > See: http://markmail.org/message/dqcil5uyigwlk2sr
> > 
> > -- Pasi
> > 
> > 
> 
> 
> 
> 

Re: migration and snapshots.

[Avi Kivity]

On 01/03/2010 01:40 AM, J Nb wrote:
> Thanks.
>
> It seems this is post 3.4 release.. any plans on getting these for older version ? (may be a question for xen-devel forum.)
>
> What about KVM ? Is there a plan to get this in to qemu / kvm ? Also, make it available to older versions of qemu/kvm.
>
> Just trying to see how this important feature can be used by people currently (which are using xen and kvm from their distros.)
>    

qemu has a 'vpc' format driver which appears to refer to vhd.  It's 
likely an older version (from the virtual PC days).  It won't give you 
good performance, but you might try it out.

-- 
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