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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