Hi all,
We just ran into a small problem where some PGs wouldn't backfill
after an OSD was marked out. Here's the relevant crush rule; being a
non-trivial example I'd like to test different permutations of the
crush map (e.g. increasing choose_total_tries):
rule critical {
ruleset 4
type replicated
min_size 1
max_size 10
step take 0513-R-0060
step chooseleaf firstn 2 type ipservice
step emit
step take 0513-R-0050
step chooseleaf firstn -2 type rack
step emit
}
Here's the osd tree:
https://stikked.web.cern.ch/stikked/view/c284b6b2
The relevant pool has size=3. The problem was that when a single OSD
in 0513-R-0060 was marked out then the rule above was only emitting 2
OSDs for a few PGs, (the missing replica was always from 0513-R-0060).
Normally I use crushtool --test --show-mappings to test rules, but
AFAICT it doesn't let you simulate an out osd, i.e. with reweight = 0.
Any ideas how to test this situation without uploading a crushmap to a
running cluster?
Cheers,
Dan
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