On Fri, 18 Jul 2014, Anand Bhat wrote: > I have question on intention of Ceph setmaxosd command. From source code, it > appears as if this is present as a way to limit the number of OSDs in the > Ceph cluster.? Yeah. It's basically sizing the array of OSDs in the OSDMap. It's a bit obsolete since the preferred way of creating new OSDs is via the 'ceph osd create <uuid>' command, which will expand max_osds as necessary, so in general you never need to interact with this value. > Can this be used to shrink the number of OSDs in the cluster without > gracefully shutting down OSDs and letting recovery/remapping to happen? Hmm, it appears yes, but I think this is a bug. I don't think we should let you shrink the value before you do remove (ceph osd rm NNN) the OSDs that would be affected. Opened ticket http://tracker.ceph.com/issues/8865 Thanks! sage
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