Ceph SSD OSD marked as HDD?

[fips]

Hi,

I have a 3 Node Ceph cluster, with serveral SAS OSDs and SSDs as their journal device.
Now I add my first SSD OSD as datastore (with itself as a jorunal).

Ceph set the Class of the SSD as "hdd" (with OSD type bluestore).
Why?
Can I change it?
Should I change it?

 

[Alwin]

Ceph may sometimes fail to get the correct device class, with the following command you can change the device class.

ceph osd crush set-device-class

Top of my head, one reason could be a raid controller not forwarding the correct information.

Aside, dont' use RAID controllers, ceph likes to have its disks under control, use HBAs (IT-mode).

 

[Mihai]

Ceph may sometimes fail to get the correct device class, with the following command you can change the device class.

ceph osd crush set-device-class

Top of my head, one reason could be a raid controller not forwarding the correct information.

Aside, dont' use RAID controllers, ceph likes to have its disks under control, use HBAs (IT-mode).

I tried to use the ceph osd crush set-device class ssd osd.12, but I am getting the following error:

no valid command found; 10 closest matches:
osd crush rule list
osd crush rename-bucket <srcname> <dstname>
osd crush weight-set ls
osd crush weight-set dump
osd crush weight-set create-compat
osd crush weight-set create <poolname> flat|positional
osd crush weight-set rm <poolname>
osd crush weight-set rm-compat
osd crush weight-set reweight <poolname> <item> <float[0.0-]> [<float[0.0-]>...]
osd crush weight-set reweight-compat <item> <float[0.0-]> [<float[0.0-]>...]
Error EINVAL: invalid command

 

[Mihai]

Ok I figured out my problem. The correct command is:

ceph osd crush set-device-class ssd osd.12

I switched the class "ssd" and osd name "osd.12"