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From Mike Tutkowski <mike.tutkow...@solidfire.com>
Subject Re: KVM VM snapshots any time soon ?
Date Wed, 05 Nov 2014 21:26:22 GMT
When you say the disk would be snapshotted, do you mean from the point of
view of the SAN or from the point of view of the hypervisor?

A SAN snapshot is no problem. I'm mainly curious to see how this would work
for a hypervisor snapshot.

Thanks!

On Wed, Nov 5, 2014 at 2:24 PM, Wido den Hollander <wido@widodh.nl> wrote:

>
>
> On 11/05/2014 10:18 PM, Mike Tutkowski wrote:
> > Hey Wido,
> >
> > Perhaps you know the answer to this:
> >
> > My main interactions with KVM have been in the form of data disks.
> >
> > I create a LUN on my SAN that gets passed to a VM as a data disk.
> >
> > In this situation, how would a snapshot of such a disk work?
> >
>
> The disk would be snapshotted, but at the same time the memory contents
> of the VM would be written to a new disk/file.
>
> > On XenServer and ESX, your data disk can be just a subset of the overall
> > LUN and hypervisor snapshots create new virtual disks that are stored
> right
> > next to the original ones on the same LUN.
> >
> > I'm un-clear how this works in KVM.
> >
>
> It would work about the same with KVM.
>
> You can look into the "virsh save" command of libvirt to see what it does.
>
> Wido
>
> > Thanks!
> > Mike
> >
> > On Wed, Nov 5, 2014 at 2:01 PM, Wido den Hollander <wido@widodh.nl>
> wrote:
> >
> >>
> >>
> >> On 11/05/2014 07:37 PM, Logan Barfield wrote:
> >>> This is a feature we would like to see as well.
> >>>
> >>> Does KVM have native support for VM/Memory snapshotting?  If so what
> are
> >>> the barriers to getting this implemented?
> >>>
> >>
> >> KVM has the support, but there is a problem with the storage.
> >>
> >> Snapshotting a disk is simple, that's supported by QCOW2, LVM, RBD, etc.
> >>
> >> But when you want to snapshot a VirtualMachine you have to store the
> >> memory contents somewhere.
> >>
> >> That is something that hasn't been worked out. Do you create a
> >> additional 'disk' for storing the memory contents?
> >>
> >> That's the barriers I currently know for implementing it.
> >>
> >> Wido
> >>
> >>>
> >>> Thank You,
> >>>
> >>> Logan Barfield
> >>> Tranquil Hosting
> >>>
> >>> On Wed, Nov 5, 2014 at 1:20 PM, Andrija Panic <andrija.panic@gmail.com
> >
> >>> wrote:
> >>>
> >>>> Anybody ?
> >>>>
> >>>> On 3 November 2014 15:23, Andrija Panic <andrija.panic@gmail.com>
> >> wrote:
> >>>>
> >>>>> Hi guys,
> >>>>>
> >>>>> do we have any plans in some near future to imlement full VM KVM
> >>>>> snapshots. So not single volume snaphost, but a reall VM snapshots.
> It
> >> is
> >>>>> already there for Xen/VMware, but not KVM.
> >>>>>
> >>>>> Any thoughts, ETA, or difficulties to implement this ?
> >>>>> Any feedback greatly appriciated...
> >>>>>
> >>>>> Best,
> >>>>>
> >>>>>
> >>>>> Andrija Panić
> >>>>>
> >>>>
> >>>>
> >>>>
> >>>> --
> >>>>
> >>>> Andrija Panić
> >>>> --------------------------------------
> >>>>   http://admintweets.com
> >>>> --------------------------------------
> >>>>
> >>>
> >>
> >
> >
> >
>



-- 
*Mike Tutkowski*
*Senior CloudStack Developer, SolidFire Inc.*
e: mike.tutkowski@solidfire.com
o: 303.746.7302
Advancing the way the world uses the cloud
<http://solidfire.com/solution/overview/?video=play>*™*

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