Re: CEPH / CloudStack features
I'm a bit too late to really share something not mentioned already above -
but in general most things work - (VM snapshots not...) - but all else is
there (resizing volumes, downloading volumes, templates, snapshots, etc),
live migration, etc - we use this with Ubuntu 14 stock libraries (recently
upgraded to versions from 16.04) - some features were originally missing
(volume resize of root vs data volumes), and hopefully the RAW vs QCOW2
format inside DB (what a mess... :) ), is also solved (we did back in the
days a lot of small internal patches, that were never validated with
community unfortunately - don't ask me why - beside proper snapshots
lifecycle (part of 4.8 an onwards) (i.e. keep really only last 1 snap on
CEPH, instead of 50+ garbage snapshots), etc.
If you need more precise info - I could even organize a small demo account
for you with private CEPH offering for VM and DATA (don't tell anyone :) )
- so you can actually see it yourself...
On Fri, 27 Jul 2018 at 16:28, Simon Weller <email@example.com> wrote:
> They're volume based snapshots at this point. We've looked at what it
> would take to support VMsnapshots, but we're not there yet, as the memory
> would need to be stored outside of the actual volume.
> Primary snapshots work well. We still need to reintroduce the code that
> allows for disabling primary to secondary coping of snapshots should an
> organization not want to do that.
> Templates are also pre-cached into Ceph to speed up deployment of VMs as
> Wido indicates below. This greatly reduced the secondary to primary copying
> of template images.
> Live migration works well land has since Wido introduced the Ceph features
> years ago.
> We have started looking at what it would take to support Ceph volume
> replication between zones/regions, as that would be a great Business
> Continuity feature.
> From: Dag Sonstebo <Dag.Sonstebo@xxxxxxxxxxxxx>
> Sent: Friday, July 27, 2018 8:32 AM
> To: dev@xxxxxxxxxxxxxxxxxxxxx
> Subject: Re: CEPH / CloudStack features
> Excellent, thanks Wido.
> When you say snapshotting – is this VM snapshots, volume snapshots or both?
> How about live migration, does this work?
> Dag Sonstebo
> Cloud Architect
> On 27/07/2018, 13:41, "Wido den Hollander" <wido@xxxxxxxxx> wrote:
> On 07/27/2018 12:18 PM, Dag Sonstebo wrote:
> > Hi all,
> > I’m trying to find out more about CEPH compatibility with CloudStack
> / KVM – i.e. trying to put together a feature matrix of what works and
> what doesn’t compared to NFS (or other block storage platforms).
> > There’s not a lot of up to date information on this – the
> configuration guide on  is all I’ve located so far apart from a couple
> of one-liners in the official documentation.
> > Could I get some feedback from the Ceph users in the community?
> Yes! So, at first, Ceph is KVM-only. Other hypervisors do not support
> RBD (RADOS Block Device) from Ceph.
> What is supported:
> - Thin provisioning
> - Discard / fstrim (Requires VirtIO-SCSI)
> - Volume cloning
> - Snapshots
> - Disk I/O throttling (done by libvirt)
> Meaning, when a template is deployed for the first time in a Primary
> Storage it's written to Ceph and all other Instances afterwards are a
> clone of that primary image.
> You can snapshot a RBD image and then have it copied to Secondary
> Storage. Now, I'm not sure if keeping the snapshot in Primary Storage
> and reverting works yet, I haven't looked at that in recent times.
> The snapshotting part on Primary Storage is probably something that
> needs some love and attention, but otherwise I think all other features
> are supported.
> I would recommend a CentOS 7 or Ubuntu 16.04/18.04 hypervisor, both
> just fine with Ceph.
> > Regards,
> > Dag Sonstebo
> >  http://docs.ceph.com/docs/master/rbd/rbd-cloudstack/
> > Dag.Sonstebo@xxxxxxxxxxxxx
> > www.shapeblue.com<http://www.shapeblue.com>
> > 53 Chandos Place, Covent Garden, London WC2N 4HSUK
> > @shapeblue
> 53 Chandos Place, Covent Garden, London WC2N 4HSUK