Thank Gallati, which means we donot need have to have shared rbd for live migration ?
On Tue, Dec 23, 2014 at 11:47 AM, René Gallati <c...@gallati.net> wrote: > Hello, > > > On 23.12.2014 09:12, Zeeshan Ali Shah wrote: > >> Has any one tried running instances over ceph i.e using ceph as backend >> for vm storage . How would you get instant migration in that case since >> every compute host will have it's own RBD . other option is to have a >> big rbd pool on head node and share it with NFS to have shared file system >> >> > When you use shared block devices, then the compute nodes don't need to > have a shared file system in openstack. All their (runtime)information > comes from either config files or the controller node/apis. > > They mount RBDs and they contact each other in the case of a live > migration so there is a sort of handover protocol, at least when you use > libvirt+qemu as hypervisor. How this is set up is described in > > http://ceph.com/docs/next/rbd/rbd-openstack/ > > Kind regards > > René > -- Regards Zeeshan Ali Shah System Administrator - PDC HPC PhD researcher (IT security) Kungliga Tekniska Hogskolan +46 8 790 9115 http://www.pdc.kth.se/members/zashah
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