Hi Francois! If I've understood your question, I think you have two options. 1. You should be able to create an empty host then move it into a room before creating any osd: ceph osd crush add-bucket <hostname> host ceph osd crush mv <hostname> room=<the room> 2. Add a custom crush location to ceph.conf on the new server so that its osds are placed in the correct room/rack/host when they are first created, e.g. [osd] crush location = room=0513-S-0034 rack=SJ04 host=cephdata20b-b7e4a773b6 Does that help? Cheers, Dan On Wed, Dec 2, 2020 at 11:29 PM Francois Legrand <fleg@xxxxxxxxxxxxxx> wrote: > > Hello, > > I have a ceph nautilus cluster. The crushmap is organized with 2 rooms, > servers in these rooms and osd in these servers, I have a crush rule to > replicate data over the servers in different rooms. > > Now, I want to add a new server in one of the rooms. My point is that I > would like to specify the room of this new server BEFORE creating osd in > this server (so the data added to the osd will be directly at the right > location). My problem is that it seems that servers appears in the > crushmap only when they have osds... and when you create a first osd, > the server is inserted in the crushmap under the default bucket (so not > in a room and then the first data stored in this osd will not be at the > correct location). I could move it after (if I do it rapidly, there will > be no that much data to move after), but I was wondering if there is a > way to either define the position of a server in the crushmap hierarchy > before creating osd or eventually to specify the room when creating the > first osd ? > > F. > _______________________________________________ > ceph-users mailing list -- ceph-users@xxxxxxx > To unsubscribe send an email to ceph-users-leave@xxxxxxx _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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