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From Mike Tutkowski <mike.tutkow...@solidfire.com>
Subject Re: KVM VM snapshots any time soon ?
Date Thu, 06 Nov 2014 14:18:43 GMT
Thanks, Wido

On Thursday, November 6, 2014, Wido den Hollander <wido@widodh.nl> wrote:

>
>
> On 11/05/2014 10:26 PM, Mike Tutkowski wrote:
> > 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?
> >
>
> Hypervisor. QCOW2 files support snapshots, so does RBD.
>
> When using iSCSI we usually create a VG on top of the LUN and then we
> can snapshot each LV which is mapped to a Instance.
>
> > 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
> <javascript:;>> 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
> <javascript:;>>
> >> 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 <javascript:;>
> >>>
> >>>>> wrote:
> >>>>>
> >>>>>> Anybody ?
> >>>>>>
> >>>>>> On 3 November 2014 15:23, Andrija Panic <andrija.panic@gmail.com
> <javascript:;>>
> >>>> 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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