Location of storage space for ceph daemons


New Member
Nov 14, 2023

I am currently planning a small cluster with proxmox+ceph. We have 7 identical servers that have 2x3.2TB SAS drives for data, and 2x64GB SSD SATA dedicated boot drives for proxmox.

Reading the ceph documentation (https://docs.ceph.com/en/latest/start/hardware-recommendations/), I see that we would require 100GB of storage space per each MON node (my proposed configuration includes 5 MON nodes for HA), or at least 50GB if I follow RedHat recommendations (https://access.redhat.com/documenta...e_selection_guide/ceph-hardware-min-recommend).

It is my first time working with ceph so I am unsure if the daemons' data is supposed to be stored on the RBD storage (the 3.2TB drives), or would it be better to keep that information on the dedicated boot drives (the 64GB drives). My problem in case of the latter is that we have enough storage to meet the 100GB recommendation by ceph.

Could you help me clear up this point?
the monitors write to /var/lib/ceph/mon (so by default on the root fs)
Is that location on the boot drive?
I am also planning to use CephFS for a repository, would that affect the answer in any way?


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