When adding a new osd to ceph, the osd_mclock_max_capacity_iops_[hdd, ssd] values do not appear in the configuration database

[plastilin]

I have been configuring and testing ceph. When OSDs were first added, the performance values of the added osds were automatically added to the configuration database. However, at some point it stopped working. Should it work? Maybe some update came that turned off this functionality?



Running the test manually passes

root@nd01:~# ceph tell osd.0 cache drop
root@nd01:~# ceph tell osd.0 bench 12288000 4096 4194304 100
{
    "bytes_written": 12288000,
    "blocksize": 4096,
    "elapsed_sec": 2.2298931299999998,
    "bytes_per_sec": 5510577.9889998594,
    "iops": 1345.3559543456688
}

root@nd01:~# ceph tell osd.0 cache drop
root@nd01:~# ceph tell osd.0 bench
{
    "bytes_written": 1073741824,
    "blocksize": 4194304,
    "elapsed_sec": 4.1815870310000003,
    "bytes_per_sec": 256778542.70157841,
    "iops": 61.220775294680216
}

What is the default test when adding osd?

Please also explain how critical is the presence of this data in the configuration database? Is it possible to operate a ceph cluster without these counters?

 

[jsterr]

What software version are you using? Those parameters should not be that important, I used it with and without and with higher values, but it didnt make any difference in performance. Is performance the same on your site? If you want you should be able to set it manually.

What did you change, so the values disappeared?

 

[plastilin]

What software version are you using?

ceph version 17.2.6 (995dec2cdae920da21db2d455e55efbc339bde24) quincy (stable)

What did you change, so the values disappeared?

I tested cluster performance with wal/db hosted on nvme and cleared osd several times. The last time I added them, the counters did not appear. + I rolled back to the configuration version "0" with the ceph config revert command