On Thu, Oct 31, 2024 at 12:54 PM Sake Ceph <ceph@paulusma.eu> wrote:
We're looking for the multiple mds daemons to be active in zone A and standby(-replay) in zone B. This scenario would also benefit people who have more powerfull hardware in zone A than zone B.
Kind regards, Sake
Op 31-10-2024 15:50 CET schreef Adam King <adking@redhat.com>:
Just noticed this thread. A couple questions. Is what we want to have MDS daemons in say zone A and zone B, but the ones in zone A are prioritized to be active and ones in zone B remain as standby unless absolutely necessary (all the ones in zone A are down) or is it that we want to have some subset of a pool of hosts in zone A and zone B have mds daemons? If it's the former, cephadm doesn't do it. The followup question in that case would be if there is some way to tell the mds daemons to prioritize certain ones to be active over others? If there is, I didn't know about it, but I assume we'd need that functionality to get that case to work.
You used to be able to do something like this in Ceph with the standby_for_[name|rank] params, but it looks like that got removed a while ago. Patrick, is there a new way to make this happen with the mds_join_fs paradigm? -Greg