Only QCOW2 files support VM snapshots - all other storage solutions don't (block device/disk passthrough = Ceph, SolidFire iSCSI, scaleIO/powerflex)
This is KVM limitation, not CloudStack. On Wed, 17 Feb 2021 at 08:08, Matthew Ritchie <ritchie...@gmail.com> wrote: > Hi Hean, > > I totally agree with you that it depends on how you use Cloudstack. > There are as many different Cloudstack uses as there are network and > storage solutions that make it an interesting puzzle to finally find the > optimal combination. > > In any way it is good to exchange our experiences and extend our knowledge > :-) > > best, > Matt > > On Tue, Feb 16, 2021 at 8:08 PM Hean Seng <heans...@gmail.com> wrote: > > > It depends on what purpose you use Cloudstack. > > > > My purpose is Selling Virtual Machine, and thus I need high performance > I/O > > . In Cloudstack, the best option is NFS, I have try few others, my > > intention is need network storage instead of local storage , and seems > NFS > > is the best fit here. Other storage options available seems little bit > of > > troublesome to implement ( i means open source storage , not commercial > > one) , CEPH is good, but performance is not really good especially if > > you have a lot VM to handle . > > > > I am using a Full SSD, with a decent Raid Card, and performance is good, > > NFS is self configured and optimize, with a basic Linux installation . > > > > As NFS is not self-recovery as CEPH, now i am worry on is the Disk > Spoil, > > replacement of disk blah blab blah ... > > > > > > > > > > > > > > > > On Wed, Feb 17, 2021 at 12:46 AM Matthew Ritchie <ritchie...@gmail.com> > > wrote: > > > > > Hi Hean, > > > > > > We currently use Solidfire as our storage solution which also has the > > > ability to provide QoS on a per-volume basis... and by that I mean > > > guaranteed IOPS. As far as I know SF is one of the strongest players in > > the > > > field and the great performance is part of what we are paying for. > > > > > > Ceph is also a great solution, but with combination with NFS I believe > it > > > has poor performance. > > > > > > I just show the Shapeblue article regarding the 4.16 KVM support for > > Dell > > > EMC PowerFlex > > > > > > > > > https://www.shapeblue.com/cloudstack-feature-first-look-storage-plugin-for-dell-emc-powerflextm/ > > > and between the lines I found this: "VM snapshot (disk-only, snapshot > > with > > > memory is not supported)" ... and I guess that also means NO VM > Snapshot. > > > > > > best, > > > Matt > > > > > > On Tue, Feb 16, 2021 at 6:03 PM Hean Seng <heans...@gmail.com> wrote: > > > > > > > I am using on NFS, and working good on vm snapshot . I guess Ceph > have > > > > comparatively poor on performance right ? > > > > > > > > On Tue, Feb 16, 2021 at 11:34 PM Matthew Ritchie < > ritchie...@gmail.com > > > > > > > wrote: > > > > > > > > > Hi Peter, > > > > > > > > > > thank you for your answer!... and that was what I was afraid of :-) > > > > > > > > > > I guess that it will be very difficult to put KVM in production and > > > then > > > > > tell the clients that a VM snapshot is not possible. > > > > > Not to mention that in our case, the high Solidfire cost imposes a > > > better > > > > > use. > > > > > > > > > > I know that this is not the right list to ask but is there a > roadmap > > > > > regarding this feature to be supported, by qemu I suppose? > > > > > > > > > > Regards, > > > > > Matt > > > > > > > > > > > > > > > On 2021/02/16 14:19:45, Peter Klein <p...@untangledtechnology.com> > > > > wrote: > > > > > > Hi Matt,> > > > > > > > > > > > > We run Cloudstack + KVM + Ceph. We haven't had any luck getting > > > > > > > snapshots to work but the alternative we've settled on for now is > > to > > > > > > > > > > take snapshots of the storage volume instead of the VM itself. > > > > Restoring > > > > > > > > > > > > from a snapshot this way is pretty cumbersome as you need to > create > > > a > > > > > > > template from the storage snapshot and then create a "new" VM > > > instance > > > > > > > > > > > using that template.> > > > > > > > > > > > > > > > > > > Thanks,> > > > > > > > > > > > > Peter> > > > > > > > > > > > > On 2/16/21 09:04, Matthew Ritchie wrote:> > > > > > > > Hi everyone,> > > > > > > >> > > > > > > > I am working on a Cloudstack + KVM + Solidfire PoC and as far > as > > I> > > > > > > > understand it is not possible to get a VM snapshot using SF as > a > > > > > primary> > > > > > > > storage.> > > > > > > >> > > > > > > > I wanted to ask the community what is the recommended way to > get > > a > > > > VM> > > > > > > > snapshot when one is using Cloudstack + KVM + (some block > storage > > > > > solution)?> > > > > > > >> > > > > > > > As it is crucial to provide to clients the "VM snapshot" > > > capability I > > > > > guess> > > > > > > > there will be some sort of experience on that matter.> > > > > > > >> > > > > > > > thanks in advance> > > > > > > > Matt> > > > > > > >> > > > > > > > > > > > > > > > > > > > > > > > -- > > > > Regards, > > > > Hean Seng > > > > > > > > > > > > > -- > > Regards, > > Hean Seng > > > -- Andrija Panić
