I all depends on the replication level you use, but let's assume 3.
Does replication level 3 mean that the data are all replicated three times in the cluster?
So you get the capacity of one machine.
4 * 1000 * 1000 / 1024 /1024 = 3.81TB
This would result in 15.24TB of raw space per machine, so 45TB of raw capacity in the cluster.
You probably shouldn't fill the disks over 80% just to be safe. So with 3x replication you have 12.2TB of usable storage.
>From 45TB to 12.2TB? So less?
I would expect something similar to RAID5 (about 36GB of usable storage).
I think I don't understand how Ceph works: could you help me to understand well?
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