best use of NVMe drives

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Hi there,
we are in the process of growing our Nautilus ceph cluster. Currently,
we have 6 nodes, 3 nodes with 2×5.5TB, 6x11TB disks and 8x186GB SSD and
3 nodes with 6×5.5TB and 6×7.5TB disks. All with dual link 10GE NICs.
The SSDs are used for the CephFS metadata pool, the hard drives are
used for the CephFS data pool. All OSD journals are kept on the drives
themselves. Replication level is 3 for both data and metadata pools.

The new servers have 12x12TB disks and 1 1.5TB NVMe drive. We expect to
get another 3 similar nodes in the near future.

My question is what is the most sensible thing to do with the NVMe
drives. I would like to increase the replication level of the metadata
pool. So my idea was to split the NVMes into say 4 partitions and add
them to the metadata pool.

Given the size of the drives and the metadata pool usage (~35GB) that
seems overkill. Would it make sense to partition the drives further and
stick the OSD journals on the NVMEs?

Regards
magnus
The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336.
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