Hi all,
I wanted to test Dan's upmap-remapped script for adding new osd's to a cluster. (Then letting the balancer gradually move pgs to the new OSD afterwards)
I've created a fresh (virtual) 12.2.10 4-node cluster with very small disks (16GB each). 2 OSD's per node.
Put ~20GB of data on the cluster.
Now when i set the norebalance flag and add a new OSD, 99% of pgs end up recovering or in recovery_wait. Only a few will be backfill_wait.
The recovery starts as expected (norebalance only stops backfilling pgs) and finished eventually
The upmap-remapped script only works with pgs which need to be backfilled. it does work for the handful of pgs in backfill_wait status but my question is:
When is ceph doing recovery in stead of backfilling? Only when the cluster is rather empty or what is the criteria? Are the OSD's too small?
Kind regards,
Caspar
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