What I also see is that I have three OSDs that have quite a lot of OMAP
data, in compare to other OSDs (~20 time higher). I don't know if this
is an issue:
I have on 2TB ssd's with 2GB - 4GB omap data, while on 8TB hdd's the omap data is
only 53MB - 100MB.
Should I manually clean this? (how? :))
The amount of omap data depends on multiple things, especially the use-case. If a given
OSD is only used for RBD, it will have a different omap experience than if it were used
for an RGW index pool.