On Tue, 16 Dec 2014 11:50:37 AM Robert LeBlanc wrote: > COW into the snapshot (like VMware, Ceph, etc): > When a write is committed, the changes are committed to a diff file and the > base file is left untouched. This only has a single write penalty, if you > want to discard the child, it is fast as you just delete the diff file. The > negative side effects is that reads may have to query each diff file before > being satisfied, and if you want to delete the snapshot, but keep the > changes (merge the snapshot into the base), then you have to copy all the > diff blocks into the base image.
Sorry to revive an old thread ... Does this mean with ceph snapshots if you leave the hanging around then the snapshot file will get larger and larger as writes are made? and reads will slow down? So not a good idea to leave snapshots of a VM undeleted for long? -- Lindsay
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