Mike, No. It will simply rebuild the degraded PGs which have nothing to do with the cache tier.
Bob On Mar 26, 2016 8:13 AM, "Mike Miller" <[email protected]> wrote: > Christian, Bob, > > Recovery would be based on placement groups and those degraded groups >>> would only exist on the storage pool(s) rather than the cache tier in >>> this scenario. >>> >>> Precisely. >> >> They are entirely different entities. >> There may be partially identical data (clean objects) in them, but that >> will with near certainty never be enough for recovery/backfill operation. >> Never mind that it would be akin to crossing the streams. >> > > Thanks, so in principle, recovery/backfill write traffic would initially > flow (from storage) into the cache tier pool until full and then migrate to > the storage, right? > > Mike > > >> Christian >> >> Bob >>> >>> On Fri, Mar 25, 2016 at 8:30 AM, Mike Miller <[email protected]> >>> wrote: >>> >>> Hi, >>>> >>>> in case of a failure in the storage tier, say single OSD disk failure >>>> or complete system failure with several OSD disks, will the remaining >>>> cache tier (on other nodes) be used for rapid backfilling/recovering >>>> first until it is full? Or is backfill/recovery done directly to the >>>> storage tier? >>>> >>>> Thanks and regards, >>>> >>>> Mike >>>> _______________________________________________ >>>> ceph-users mailing list >>>> [email protected] >>>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >>>> >>>> >> >>
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