Hello community,
We have very small ceph cluster of just 12 OSDs (1 per small server), 3
MDS (one active) and 1 cephFS client.
CephFS client is running Centos7, kernel 3.10.0-957.27.2.el7.x86_64.
We created 3 MDS servers for redundancy and we mount our filesystem by
connecting to 3 of them. But what we have noticed, is that if we power
off first one in the list in mount option - then everything freezes on a
client and in most cases we have to bring MDS back and do force-reset on
a client.
What are we doing wrong? Shouldn't client automatically switch to any
other MDS server in a microsecond and keep running? And why it affects
only first one? - We tried powering off second or third MDS host and
that had no effect on a client-side.
Should we have local MDS on the client and just connect to it? Or should
there be some other logic or setting? - to be honest, we have used
/ceph-//deploy/ tool and haven't did much of configuration..
Thank you for understanding and help. :)
Anton Aleksandrov.
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