Just co-locate them with your OSDs. You can can control how much RAM the MDSs use with the "mds cache memory limit" option. (default 1 GB)
Note that the cache should be large enough RAM to keep the active working set in the mds cache but 1 million files is not really a lot.
As a rule of thumb: ~1GB of MDS cache per ~100k files.
64GB of RAM for 12 OSDs and an MDS is enough in most cases.
Paul
2018-06-19 15:34 GMT+02:00 Denny Fuchs <linuxmail@xxxxxxxx>:
Hi,
Am 19.06.2018 15:14, schrieb Stefan Kooman:
Storage doesn't matter for MDS, as they won't use it to store ceph data
(but instead use the (meta)data pool to store meta data).
I would not colocate the MDS daemons with the OSDS, but instead create a
couple of VMs (active / standby) and give them as much RAM as you
possibly can.
thanks a lot. I think, we would start with round about 8GB and see, what happens.
cu denny
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Paul Emmerich
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Looking for help with your Ceph cluster? Contact us at https://croit.io
croit GmbH
Freseniusstr. 31h
81247 München
www.croit.io
Tel: +49 89 1896585 90
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