18 Jun
2020
18 Jun
'20
6:45 a.m.
Hello
I'm running ceph 14.2.9.
During heavy backfilling due to rebalancing one OSD crashed.
I want to recover the data from the lost OSD before continuing the
backfilling so i out'ed the lost osd and ran "ceph osd set norebalance".
But i'm noticing with the norebalance flag set the system does not backfill
the undersized PG's. Only the degraded ones. So now i have plenty of
undersized PG's and the system is idle.
How can i recover the undersized PG's before resuming normal
backfilling/rebalancing ?
Regards,
Kári
18 Jun
18 Jun
9:18 a.m.
Hi Kári,
The backfilling process will prioritize those backfill request that are
for degrade pgs or undersized pgs:
"
....
The next priority is backfill of degraded PGs and is a function of the
degradation. A backfill for a PG missing two replicas will have a
priority higher than a backfill for a PG missing one replica. The lowest
priority is backfill of non-degraded PGs.
...." -
https://docs.ceph.com/docs/nautilus/dev/osd_internals/backfill_reservation/
Does that help you?
kind regards,
Wout
42on
On 18-06-2020 08:45, Kári Bertilsson wrote:
Hello
I'm running ceph 14.2.9.
During heavy backfilling due to rebalancing one OSD crashed.
I want to recover the data from the lost OSD before continuing the
backfilling so i out'ed the lost osd and ran "ceph osd set norebalance".
But i'm noticing with the norebalance flag set the system does not backfill
the undersized PG's. Only the degraded ones. So now i have plenty of
undersized PG's and the system is idle.
How can i recover the undersized PG's before resuming normal
backfilling/rebalancing ?
Regards,
Kári
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Kári Bertilsson -
Wout van Heeswijk