Hi,
1,5 GB MDS cache for 20 clients is not enough, I would start with
increasing that to 4 or 8 GB and see if the problems still occur.
Regards,
Eugen
Zitat von Petr Belyaev <[email protected]>:
Hi all,
I have a very small Ceph setup - 3 OSDs, 3 MDS, 3 MON, CephFS with
~20 ceph-fuse clients connected. All run version 14.2.9 (both
servers and clients).
Some clients work with a relatively large CephFS directory, few tens
of thousands of files, with lots of files being added and deleted
all the time. Almost every day I see exactly the same pattern when
system goes under load:
- One of the clients starts running slow (e.g. high CPU or
out-of-memory, sometimes with OOM killer intervention)
- A number of requests from other clients gets blocked for ~15
seconds waiting for the (r/w/x)lock on other files in the same
directory
- Objecter requests empty
- No requests visibly running in the dump_ops_in_flight output, only
those waiting for the lock
MDS cache size is 1.5 gb, total capacity - around 1TB, usual load is
~300 [rw]ops, 3-4 mb/s, most of the config is the default one.
Have somebody seen similar issues before?
Best regards,
Petr Belyaev
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