Chapter 22. Reviewing CRUSH Tunables
If you have been using Ceph for awhile and you are using an older CRUSH tunables setting such as
bobtail, you should investigate setting your CRUSH tunables to
Resetting your CRUSH tunables may result in significant rebalancing. See the Storage Strategies Guide, Chapter 9, Tunables for additional details on CRUSH tunables.
ceph osd crush tunables optimal