Hi,
We have a medium-sized (2520 osds, 42 hosts, 88832 pgs, 15PB raw
capacity) Jewel cluster (on Ubuntu), and in normal operation, our mon
store size is around the 1.2G mark. I've noticed, though, that when
doing larger rebalances, they can grow really very large (up to nearly
70G, which is nearly all the rootfs on our mons); when recently adding
more osds to the cluster (and consequently increasing pg number by
increasing the size of an existing pool) we nearly ran out of disk space
on the mons due to their mon stores getting very big.
Since I imagine having your mons run out of disk mid-rebalance is A Bad
Idea, is there a way to estimate how big a mon store might get?
Thanks,
Matthew
--
The Wellcome Trust Sanger Institute is operated by Genome Research
Limited, a charity registered in England with number 1021457 and a
company registered in England with number 2742969, whose registered
office is 215 Euston Road, London, NW1 2BE.
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