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 <[email protected]> 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 <[email protected]> >>> wrote: >>> >>>> Anybody ? >>>> >>>> On 3 November 2014 15:23, Andrija Panic <[email protected]> >> 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 >>>> -------------------------------------- >>>> >>> >> > > >
