.. tip:: Configuring the operating system with swap to provide additional
virtual memory for daemons is not advised for modern systems. Doing
- may result in lower performance, and your Ceph cluster may well be
+ so may result in lower performance, and your Ceph cluster may well be
happier with a daemon that crashes vs one that slows to a crawl.
- When using the legacy FileStore back end, the OS page cache was used for caching
- data, so tuning was not normally needed. When using the legacy FileStore backend,
- the OSD memory consumption was related to the number of PGs per daemon in the
- system.
+ When using the legacy Filestore back end, the OS page cache was used for caching
+ data, so tuning was not normally needed. OSD memory consumption is related
+ to the workload and number of PGs that it serves. BlueStore OSDs do not use
+ the page cache, so the autotuner is recommended to ensure that RAM is used
+ fully but prudently.
Data Storage