Thanks, Wido -- words to live by.
I had all kinds of problems with mon DBs not compacting under Firefly, really
pointed out the benefit of having ample space on the mons -- and the necessity
of having those DB's live on something faster than an LFF HDD.
I've had this happen when using ceph-gentle-reweight to slowly bring in a large
population of new OSDs. Breaking that into phases helps a bunch, or setting a
large -i interval.
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