Hi,
you could benefit from directory pinning [1] or dynamic subtree
pinning [2]. We had great results with manual pinning in an older
Nautilus cluster, didn't have a chance to test the dynamic subtree
pinning yet though. It's difficult to tell in advance which option
would suit best your use-case, so you'll probably have to try.
Regards,
Eugen
[1]
https://docs.ceph.com/en/reef/cephfs/multimds/#manually-pinning-directory-trees-to-a-particular-rank
[2]
https://docs.ceph.com/en/reef/cephfs/multimds/#dynamic-subtree-partitioning-with-balancer-on-specific-ranks
Zitat von zxcs <zhuxiongcs@xxxxxxx>:
Hi, experts,
we have a product env build with ceph version 16.2.11 pacific, and
using CephFS.
Also enable multi active mds(more than 10), but we usually see load
unbalance on our client request with these mds.
see below picture. the top 1 mds has 32.2k client request. and the
last one only 331.
this always lead our cluster into very bad situation. say many MDS
report slow requests…
...
7 MDSs report slow requests
1 MDSs behind on trimming
…
So our question is how to set those mdss load balance? Could any one
please help to shed some light here?
Thanks a ton!
Thanks,
xz
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