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From Simon Weller <swel...@ena.com>
Subject Re: [Feature Request] VM Snapshot based on KVM+Ceph
Date Tue, 12 Jul 2016 13:39:00 GMT
Wei's KVM QCOW2 snapshot PR works very well. I tested it a few months back -  It would be great
to get this into 4.9.10.


In regards to the Ceph snapshot challenges, it is possible to emulate the behaviour you want
(sans the RAM component). We pushed a PR a couple of months ago to enable root detach of volumes
on KVM (It has been merged into 4.7-forward, 4.8-forward and 4.9 RC).

We use it to emulate a snapshot revert with Ceph by using createVolume sourced from a snapshot,
then detaching and reattach the root volume of a VM with device id of 0.
This preserves the previous volume history and allows the user to switch back and forth between
different snapshots.


We would like a fully featured "VM + memory" Ceph based snapshot as well, but as Wido has
indicated, a lot has to happen before that will be possible and we have more research to do
in order to understand the challenges. I would guess Redhat is going to be very interested
in getting this into libvirt, as they are obviously pushing Ceph aggressively.


- Si

________________________________
From: Wei ZHOU <ustcweizhou@gmail.com>
Sent: Tuesday, July 12, 2016 2:25 AM
To: dev@cloudstack.apache.org
Subject: Re: [Feature Request] VM Snapshot based on KVM+Ceph

Paul,

If you mean VM snapshot on QCOW2, there is a PR on github for it.

-Wei

2016-07-12 5:58 GMT+02:00 Paul Shadwell <paul@shadwell.ch>:

> This is a feature that has been missing from Cloudstack since the
> beginning when using KVM as the hypervisor.
> It's been asked for many times but still no support.
> This would be a huge plus for Cloudstack if this feature was added and
> make it a much more viable product for end users.
> KVM is usually chosen because 1: it's free 2: it has many features that
> make it a much better choice for large installations.
> Many have ended up either writing their own VM snapshot solution, or
> simply hiding the icon from the customer.
> I'm surprised that after years of waiting for this feature to be added,
> it's still missing.
> I know it's not totally the Cloudstack Dev team's fault that VM Snapshots
> are missing from KVM support but I do think this is a list opportunity for
> a big win if they did something about it.
>
> Just my 2 penneth on this subject that has plagued me on a daily basis
> supporting Cloudstack installs.
>
> Regards
> Paul
>
>
> > On Jul 12, 2016, at 05:19, ilya <ilya.mailing.lists@gmail.com> wrote:
> >
> > Just FYI:
> >
> > You can ask on this list for sponsored feature development if this is
> > something that needs prompt resolution.
> >
> > Regards
> > ilya
> >
> >> On 7/8/16 7:07 PM, ??? wrote:
> >> Hi,  Developers
> >>
> >>
> >>
> >> We deployed ACS+KVM+Ceph in our environment.  Everything looks fine
> >> except the VM snapshot feature (not volume backup) is missing in current
> >> ACS version which seems only supported by XenServer/ESXi.
> >>
> >>
> >>
> >> Wondering if we can have this on the roadmap as well.  @Wido, do you
> >> have any plan ?
> >>
> >>
> >>
> >> Thanks !
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >> private cloud2  *We Deliver Enterprise-Grade Cloud !*
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