On Wed, 2 Sep 2015, Dan van der Ster wrote:
> 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?
crushtool --test --weight <osdid> 0 ...
sage
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