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 <linuxm...@4lin.net>: > 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 > > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > -- Paul Emmerich 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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