Short: how to sure avoid (if possible) fs freezes on 1 of 3 mds rejoin?
ceph version 0.94.3-242-g79385a8 (79385a85beea9bccd82c99b6bda653f0224c4fcd)
I moving 2 VM clients from ocfs2 (starting to deadlock VM on snapshot) to cephfs
(at least I can backup it). May be I just don't see it before, may be there are
cephfs pressure problem, but while 1 of 3 mds rejoin (slow!) - whole mds cluster
stuck (but, good news - all clients alive after). How to make mds cluster
reliable on at least 1 restart?
My current mds config:
[mds]
mds recall state timeout = 120
mds bal mode = 1
mds standby replay = true
mds cache size = 500000
mds mem max = 2097152
mds op history size = 50
# vs. laggy beacon
mds decay halflife = 9
mds beacon interval = 8
mds beacon grace = 30
[mds.a]
host = megaserver1
[mds.b]
host = megaserver3
[mds.c]
host = megaserver4
(I trying to unswitch all non-defaults, IMHO no results - fixme)
Or may be I need special care on mds stop (now - SIGKILL).
--
WBR, Dzianis Kahanovich AKA Denis Kaganovich, http://mahatma.bspu.unibel.by/
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