Mark,
We are running a mix of RGW, RDB, and CephFS. Our CephFS is pretty big,
but we're moving a lot of it to RGW. What prompted me to go looking for a
guideline was a high frequency of Spillover warnings as our cluster filled
up past the 50% mark. That was with 14.2.9, I think. I understand t
Anthony,
I had recently found a reference in the Ceph docs that indicated something
like 40GB per TB for WAL+DB space. For a 12TB HDD that comes out to
480GB. If this is no longer the guideline I'd be glad to save a couple
dollars.
-Dave
--
Dave Hall
Binghamton University
kdh...@binghamton.edu
In releases before … Pacific I think, there are certain discrete capacities
that DB will actually utilize: the sum of RocksDB levels. Lots of discussion
in the archives. AIUI in those releases, with a 500 GB BlueStore WAL+DB device,
you’ll with default settings only actually use ~~300 GB most
FWIW, those guidelines try to be sort of a one-size-fits-all
recommendation that may not apply to your situation. Typically RBD has
pretty low metadata overhead so you can get away with smaller DB
partitions. 4% should easily be enough. If you are running heavy RGW
write workloads with small
