Very simple question: what happen if server bound to the cache pool goes down? For example, a read-only cache could be archived by using a single server with no redudancy. Is ceph smart enough to detect that cache is unavailable and transparently redirect all request to the main pool as usual ? This allow the usage of one very big server as cache-only. No need for redundacy. Second question: how can I set cache pool to be on a defined OSDs list and not distributed across all OSDs ? Should I change the crushmap ? I would like to set a single server (and all of its OSDs) for the cache pool.
 |