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 <w...@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 <w...@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.pa...@gmail.com > > > >>> wrote: > >>> > >>>> Anybody ? > >>>> > >>>> On 3 November 2014 15:23, Andrija Panic <andrija.pa...@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.tutkow...@solidfire.com o: 303.746.7302 Advancing the way the world uses the cloud <http://solidfire.com/solution/overview/?video=play>*™*
