[ceph-users] Re: How to speed up the backfill on replicated pool?

Note that the below refers to the volatile cache on HDDs, not any cache (BBU or FBWC or otherwise) on a RAID HBA, which is a completely different matter. Disabling the volatile write cache on HDDs can significantly improve op latency.

On Oct 14, 2025, at 11:30 AM, Kirby Haze <kirbyhaze01@gmail.com> wrote:

On another note, maybe check as well if you have writeback caches disabled since you are on hdds. write through mode is generally recommended. https://docs.ceph.com/en/latest/start/hardware-recommendations/#write-caches