> From: Warren Wang <[email protected]> > Sent: Wednesday, October 12, 2016 10:02 PM > To: Adam Kijak > Cc: Abel Lopez; openstack-operators > Subject: Re: [Openstack-operators] [openstack-operators][ceph][nova] How do > you handle Nova on Ceph? > > If fault domain is a concern, you can always split the cloud up into 3 > regions, each having a dedicate Ceph cluster. It isn't necessarily going to > mean more hardware, just logical splits. This is kind of assuming that the > network doesn't share the same fault domain though.
This is not an option because having Region1-1, Region1-2, ..., Region1-10 would not be very convenient for users. > Alternatively, you can split the hardware for the Ceph boxes into multiple > clusters, and use multi backend Cinder to talk to the same set of hypervisors > to use multiple Ceph clusters. We're doing that to migrate from one Ceph > cluster to another. You can even mount a volume from each cluster into a > single instance. Multiple Ceph clusters on Cinder is not a problem, I agree. Unfortunately we use Ceph for Nova (disks of instances are on Ceph directly). > Keep in mind that you don't really want to shrink a Ceph cluster too much. > What's "too big"? You should keep growing so that the fault domains aren't > too small (3 physical rack min), or you guarantee that the entire cluster > stops if you lose network. > Just my 2 cents, Thanks! _______________________________________________ OpenStack-operators mailing list [email protected] http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators
