Hi Patrick,
I haven't gone through this thread yet but I want to note for those
reading that we do now have documentation (thanks for the frequent
pokes Janek!) for the recall configurations:
https://docs.ceph.com/en/latest/cephfs/cache-configuration/#mds-recall
Please let us know if it's missing information or if something could
be more clear.
The documentation has helped a big deal already and I've been playing
around with them quite a bit recently. What's missing, obviously, are
recommended settings for individual scenarios (at least ballparks). But
that is hard to come by without experimenting first (I wouldn't call our
deployment massive, but very likely significantly above average and I
don't know what scale the developers are usually testing at). As I
mentioned in the other thread, I am testing Dan's recommendations at the
moment and will refine them for our purposes. The effects of individual
tweaks are hard to assess without dedicated benchmarks (although "MDS
not hanging up" is already somewhat of a benchmark :-)).
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