Minimal MDS for CephFS on OSD hosts

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Hi,

for our application, we need a shared storage for round about ~500.000 (max ~1mio) files (count inodes / ~2-4TB), until our app can talk with Rados directly.

Because our rack is full, we can't add any more physical machines, so I'm asking, if it is O.K, to put the MDS on the OSD hosts.

We have six OSD with 64GB Ram and 2 x Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz. Every OSD has six SSDs and six HDDs.
The internal CEPH LAN is connected via 100Gbit (Mellanox CX4).

Is it OK, should we don't do it ... because the resources are to less...

We have also a 2nd cluster which holds the VMs with also 128Gb Ram and 2 x Intel(R) Xeon(R) CPU E5-2650 v4 @ 2.20GHz. But with only system disks (ZFS Raid1).

Both clusters are a Proxmox 5 (Debian Stretch).


Any suggestions ?
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