Setting a device class

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Use this information to set a device class for an OSD.

To set a device class for an OSD, run the following:

Syntax 

ceph osd crush set-device-class  CLASS OSD_ID [OSD_ID..]

Example 

[ceph: root@host01 /]# ceph osd crush set-device-class hdd osd.0 osd.1
[ceph: root@host01 /]# ceph osd crush set-device-class ssd osd.2 osd.3
[ceph: root@host01 /]# ceph osd crush set-device-class bucket-index osd.4
Note: Ceph might assign a class to a device automatically. However, class names are simply arbitrary strings. There is no requirement to adhere to hdd, ssd or nvme. In the foregoing example, a device class named bucket-index might indicate an SSD device that a Ceph Object Gateway pool uses exclusively bucket index workloads. To change a device class that was already set, use ceph osd crush rm-device-class first.