On 10/13/22 11:01, Nicola Mori wrote:
Hi Stefan,
the cluster is built of several old machines, with different numbers of
disks (from 8 to 16) and disk sizes (from 500 GB to 4 TB). After the PG
increase it is still recovering: the number of PGP is at 213 and has to
grow up to 256. The balancer status gives:
{
"active": true,
"last_optimize_duration": "0:00:00.000347",
"last_optimize_started": "Thu Oct 13 08:59:22 2022",
"mode": "upmap",
"optimize_result": "Too many objects (0.051218 > 0.050000) are
misplaced; try again later",
"plans": []
}
and I guess that this means that optimization is ongoing, right?
Yes. So while there is splitting going on, data will move and things
might be sub-optimal. When this process is done it should have improved.
Note that the Ceph balancer might not deal well with heterogeneous
nodes. If standard deviation is still high you might want to try Jonas
Jelten's placement optimizer [1].
Gr. Stefan
[1]: https://github.com/TheJJ/ceph-balancer
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