29 Jun
2021
29 Jun
'21
6:36 a.m.
At a Ceph Day in Hillsboro someone, forgive me for not remembering who, spoke of running production on servers with 2GB RAM per OSD. He said that it was painful, required a lot of work, and would not recommend it. ymmv.
Yeah, I wouldn't want to go below 4GB RAM.
FWIW, I have been running several production clusters with osd_memory_target = 3GB without issues (with Nautilus / Bluestore, 4TB to 12TB hard drives and from 300 to 1400 OSDs per cluster). I have an external caching layer for hot data though, so that cache misses on Ceph are the common case and not an issue. Eric