There's a bit of discussion on this at the original PR: https://github.com/ceph/ceph/pull/31677 Sage claims the IO interruption should be smaller with osd_fast_shutdown than without. -- dan On Fri, Aug 14, 2020 at 10:08 AM Manuel Lausch <manuel.lausch@1und1.de> wrote:
Hi Dan,
stopping a single OSD took mostly 1 to 2 seconds betwenn stop and the first reporting in ceph.log. Stopping a whole node, in this case 24 OSDs, in the most cases it took 5 to 7 seconds. After the reporting peering begins, but this is quite fast.
Since I have the fast shutdown disabled. The "reporting down by itself" messages appear more or less immediately, the cluster peers and all works as expected and without trouble.
Manuel
On Thu, 13 Aug 2020 16:45:20 +0200 Dan van der Ster <dan@vanderster.com> wrote:
OK I just wanted to confirm you hadn't extended the osd_heartbeat_grace or similar.
On your large cluster, what is the time from stopping an osd (with fasst shutdown enabled) to: cluster [DBG] osd.317 reported immediately failed by osd.202
-- dan
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