Gregory Farnum writes: > On Tue, Mar 7, 2017 at 12:43 PM, Kent Borg <kentborg@xxxxxxxx> wrote: >> I would love it if someone could toss out some examples of the sorts >> of things snapshots are good for and the sorts of things they are >> terrible for. (And some hints as to why, please.) > They're good for CephFS snapshots. They're good at RBD snapshots as > long as you don't take them too frequently. We take snapshots of about thirty 2-TB RBD images (Ceph Cinder volumes) every night. We keep about 60 of each around. Does that still fall under "reasonable"? One round of snapshots is deleted every night; that causes significant load on our cluster - currently Hammer, will be upgraded to Jewel soon. Most of the volumes (and thus snapshots) don't have the "object-map" feature enabled yet; maybe after the Jewel upgrade we can add object-maps to them to reduce the cost of deleting the snapshots. Do object-maps help with snap trimming, or am I overly optimistic? -- Simon. _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
 |