how to rename a ceph OSD?

[Magneto]

Hi,

Is it possible to rename a CEPH OSD?

^Croot@virt3:~# ceph osd tree
ID CLASS WEIGHT   TYPE NAME      STATUS REWEIGHT PRI-AFF
-1       87.33948 root default
-3       29.11316     host virt1
 1   hdd  7.27829         osd.1      up  1.00000 1.00000
 2   hdd  7.27829         osd.2      up  1.00000 1.00000
 3   hdd  7.27829         osd.3      up  1.00000 1.00000
 4   hdd  7.27829         osd.4      up  1.00000 1.00000
-5       29.11316     host virt2
 0   hdd  7.27829         osd.0      up  1.00000 1.00000
 5   hdd  7.27829         osd.5      up  1.00000 1.00000
 6   hdd  7.27829         osd.6      up  1.00000 1.00000
 7   hdd  7.27829         osd.7      up  1.00000 1.00000
-7       29.11316     host virt3
 8   hdd  7.27829         osd.8      up  1.00000 1.00000
 9   hdd  7.27829         osd.9      up  1.00000 1.00000
10   hdd  7.27829         osd.10     up  1.00000 1.00000
12   hdd  7.27829         osd.12     up  1.00000 1.00000

I would like to re-arrange the OSD's in chronological order. Simply adding and removing them seems to just mess things up.

 

[Alwin]

Is it possible to rename a CEPH OSD?

The ID of an OSD is sequential and not bound to hardware, as the idea is to move OSDs from one server to the other, without reconfiguration or recreation. If a OSD is destroyed in the cluster, a new OSD will reuse the old ID.

While I would say, don't care about the ordering, you still can give OSDs manually a ID on creation, if you like.
http://docs.ceph.com/docs/luminous/rados/operations/add-or-rm-osds/