OSD RAM recommendations

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I'm a bit confused by the RAM recommendations for OSD servers. I have also seen conflicting information in the lists (1 GB RAM per OSD, 1 GB RAM per TB, 3-5 GB RAM per OSD, etc.). I guess I'm a lot better with a concrete example:

Say this is your cluster (using Bluestore):

8 Machines serving OSDs. Each machine is the same:

12 x 10 TB disks for data for 120 TB total per machine (1 disk per OSD)

Each machine is running 12 OSD daemons. The whole cluster has 96 OSDs (8 x 12) and a total of 960 TB of space.

What is the recommended amount of RAM for each of the 8 machines serving OSDs?

- 12 GB (1 GB per OSD)
- 10 GB (1 GB per TB of each OSD)
- 120 GB (1 GB per TB per machine)
- 960 GB (1 GB per TB for the whole cluster)
- 36 to 60 GB (3-5 GB per OSD)
- None of the above (then what is the answer?)

Thanks!

Jorge

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