Hey guys, most of my osds have HDD for block and SSD for db. But according to "ceph osd metadata" bluefs_db_type = hdd and bluefs_db_rotational = 1. lsblk -o name, rota reveals the following (sdb is db device for 3 hdds): sdb 0 ├─ceph--block--dbs--b77a8d7c--bdb5--420b--ad27--65e1d5080550-osd--block--db--b164ba4c--48c9--41a0--8b5e--ae3a6a23a22c 1 ├─ceph--block--dbs--b77a8d7c--bdb5--420b--ad27--65e1d5080550-osd--block--db--1c7aa9a1--791d--4ed6--8049--9fba8d5ac828 1 └─ceph--block--dbs--b77a8d7c--bdb5--420b--ad27--65e1d5080550-osd--block--db--ec92f9c6--d651--46ed--b6cd--4cf37c8ce284 1 I am pretty sure sdb had rota 0 during osd deployment (still has, but lvm volumes don’t). Question 1: Is the output of osd metadata for bluefs_db_type and bluefs_db_rotational relevant for how the osd process is treating the disks? (or does it just reflect the value of /sys/block/<device>/queue/rotational?) Question 2: How can I verify that the osd process is treating the db device as an ssd? If i remember correctly, the osd process is using different parameters if db is on SSD instead of HDD. Best regards Felix --------------------------------------------------------------------------------------------- --------------------------------------------------------------------------------------------- Forschungszentrum Juelich GmbH 52425 Juelich Sitz der Gesellschaft: Juelich Eingetragen im Handelsregister des Amtsgerichts Dueren Nr. HR B 3498 Vorsitzender des Aufsichtsrats: MinDir Volker Rieke Geschaeftsfuehrung: Prof. Dr.-Ing. Wolfgang Marquardt (Vorsitzender), Karsten Beneke (stellv. Vorsitzender), Prof. Dr.-Ing. Harald Bolt, Dr. Astrid Lambrecht, Prof. Dr. Frauke Melchior --------------------------------------------------------------------------------------------- ---------------------------------------------------------------------------------------------