Ceph

test/osd/osd-markdown.sh's tests try to set the OSD markdown count and period to 5 and 40s, and then mark the OSD down 6 times over 40s, waiting for (40/6)s after each mark down, and expecting the OSD to stay up except for the last markdown.

This requires that the osd respond too quickly and reliably, IMO. It would be better, I think, to have a fixed per-iteration sleeptime, so that the markdowns could comfortably occur within the given time interval, and to make sure the time interval is comfortably longer than "count * sleeptime", so that delays in issuing any of the commands (the actual 'down' command or the osd tree commands) don't cause the period to expire.