+2 :) On 28 May 2015 at 17:21, Andrei Mikhailovsky <and...@arhont.com> wrote:
> +1 for this > ----- Original Message ----- > > From: "Logan Barfield" <lbarfi...@tqhosting.com> > To: dev@cloudstack.apache.org > Sent: Thursday, 28 May, 2015 3:48:09 PM > Subject: Re: [Feature] Cloudstack KVM with RBD > > Hi Star, > > I'll +1 this. I would like to see support for RBD snapshots as well, > and maybe have a method to "backup" the snapshots to secondary > storage. Right now for large volumes it can take an hour or more to > finish the snapshot. > > I have already discussed this with Wido, and was able to determine > that even without using native RBD snapshots we could improve the copy > time by saving the snaps as thin volumes instead of full raw files. > Right now the snapshot code when using RBD specifically converts the > volumes to a full raw file, when saving as a qcow2 image would use > less space. When restoring a snapshot the code current specifically > indicates the source image as being a raw file, but if we change the > code to not indicate the source image type qemu-img should > automatically detect it. We just need to see if that's the case with > all of the supported versions of libvirt/qemu before submitting a pull > request. > > Thank You, > > Logan Barfield > Tranquil Hosting > > > On Wed, May 27, 2015 at 9:18 PM, Star Guo <st...@ceph.me> wrote: > > Hi everyone, > > > > Since I have test cloudstack 4.4.2 + kvm + rbd, deploy an instance is so > > fast apart from the first deployment because copy template from secondary > > storage (NFS) to primary storage (RBD). That is no problem. > > However, when I do some volume operation, such as create snapshot, create > > template, template deploy ect, it also take some time to finish because > copy > > data between primary storage and secondary storage. > > So I think that if we support the same rbd as secondary storage, and use > > ceph COW feature, it may reduce the time and just some seconds. > (OpenStack > > can make glance and cinder as the same rbd) > > > > Best Regards, > > Star Guo > > > > -- Andrija Panić
