move osd to another node

[Alwin]

I have posted the wrong link. This should be the right one.
https://forum.proxmox.com/threads/osd-move-issue.56932/post-263918

 

[n0ll]

I got the solution:

1. Stop / Out the OSD you want to move
2. Physically move OSD to new node
3. In Proxmox on new node > Open a shell and type:

pvscan
ceph-volume lvm activate --all

4. Have some patience, it can take at least 30 seconds - after some time, chech Ceph > OSD (reload) and you should see the OSD's start to appear on the new node!

 

[DC-CA1]

if you don't have a separate (shared) journal device, you can just down and out the OSD and physically move it from one host to another. (hot-)plugging it in should automatically start the OSD service on the new host, and you can mark the osd as "in" on the GUI.

if you have a separate journal device only used for the particular osd, you can move it together with the OSD and it should work as well.

if you have a shared journal device, you might be able to move all the OSDs using it and the journal, all at the same time - I have never tried this though.

if you only want to move one of several OSDs sharing a journal, this is AFAIK not possible, and you need to actually remove it and create a new OSD from scratch on the new host, using the moved disk.

Hi @fabian by journaling you refer to metaserver when using CephFS ? so i assume it do not apply to RBD?

 

[DC-CA1]

I got the solution:

1. Stop / Out the OSD you want to move
2. Physically move OSD to new node
3. In Proxmox on new node > Open a shell and type:

pvscan
ceph-volume lvm activate --all

4. Have some patience, it can take at least 30 seconds - after some time, chech Ceph > OSD (reload) and you should see the OSD's start to appear on the new node!

can we import it in a completly other cluster node , or it as to be part from a previous member node from the same cluster ?

 

[fabian]

Hi @fabian by journaling you refer to metaserver when using CephFS ? so i assume it do not apply to RBD?

no, I mean the journal/WAL of the OSD:

https://docs.ceph.com/en/quincy/rados/configuration/bluestore-config-ref/#devices