Hi, 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 [1] 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 work just fine with Ceph. Wido > Regards, > Dag Sonstebo > > [1] http://docs.ceph.com/docs/master/rbd/rbd-cloudstack/ > > dag.sonst...@shapeblue.com > www.shapeblue.com > 53 Chandos Place, Covent Garden, London WC2N 4HSUK > @shapeblue > > >
