I have certainly seen cases where the OMAPS have not stayed within the 
RocksDB/WAL NVME space and have been going down to disk.

This was on a large cluster with a lot of objects but the disks that where 
being used for the non-ec pool where seeing a lot more actual disk activity 
than the other disks in the system.

Moving the non-ec pool onto NVME helped with a lot of operations that needed to 
be done to cleanup a lot of orphaned objects.

Yes this was a large cluster with a lot of ingress data admitedly.

Darren Soothill

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> On 29 May 2024, at 21:24, Anthony D'Atri <a...@dreamsnake.net> wrote:
> 
> 
> 
>> You also have the metadata pools used by RGW that ideally need to be on NVME.
> 
> The OP seems to intend shared NVMe for WAL+DB, so that the omaps are on NVMe 
> that way.
> 
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