Hi,
we are about to setup a new Ceph cluster for our Openstack cloud. Ceph
is used for images, volumes and object storage. I'm unsure to handle
these cases and how to move the data correctly.
Object storage:
I consider this the easiest case, since RGW itself provides the
necessary means to synchronize clusters. But the pools are rather small
(~5 TB for buckets), so maybe there's an easier way? How does RGW refer
to the various pools internally? By name? By ID? (ID would be a problem,
since a simple pool copy won't work in this case)
Images:
Straight-forward attempt would be exporting all images with qemu-img
from one cluster, and uploading them again on the second cluster. But
this will break snapshots, protections etc.
Volumes:
This is the most difficult case. The pool is the largest one affected
(~60 TB), and many volumes are boot-from-volume instances acting as COW
copy for an image. I would prefer not to flatten these images and thus
generate a lot more data.
There are other pools we use outside of Openstack, so adding the new
hosts to the existing cluster, moving the data by crush rules and
splitting the cluster afterwards is not an option. Keeping all hosts in
a single cluster and separating the pools logically within crush is also
undesired due to administrative reasons (but will be the last resort if
necessary).
Any comments on this? How did you move individual pools to a new cluster
in the past?
Regards,
Burkhard
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