> On May 7, 2025, at 5:06 AM, Janne Johansson <icepic...@gmail.com> wrote: > > Den ons 7 maj 2025 kl 10:59 skrev Torkil Svensgaard <tor...@drcmr.dk>: >> We are looking at a cluster split between two DCs with the DCs as >> failure domains. >> >> Am I right in assuming that any recovery or backfill taking place should >> largely happen inside each DC and not between them? Or can no such >> assumptions be made? >> Pools would be EC 4+8, if that matters. > > Unless I am mistaken, the first/primary of each PG is the one "doing" > the backfills, so if the primaries are evenly distributed between the > sites, the source of all backfills would be in the remote DC in 50% of > the cases.
Are we talking about recovery, or backfill? > I do not think the backfills are going to calculate how it can use > only "local" pieces to rebuild a missing/degraded PG piece without > going over the DC-DC link even if it is theoretically possible. The LRC plugin might be able to localize *recovery*, but backfill from adding OSDs, changing CRUSH rules, etc. would always have to hit both. > > -- > May the most significant bit of your life be positive. > _______________________________________________ > ceph-users mailing list -- ceph-users@ceph.io > To unsubscribe send an email to ceph-users-le...@ceph.io _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-le...@ceph.io
