RBD persistent cache support

[plastilin]

I would like to try using ssd as rbd persistent cache CEPH device. But it didn't work for me because I can't specify the DAX mount option. Is this functionality missing in PVE or am I doing something wrong?

 

[plastilin]

I answer my own question. I have nvme which I wanted to cache - doesn't support DAX.

 

[jasonsansone]

DAX is just for Optane DCPMM and NVDIMMs. The SSD mode works great with a few caveats.

 

[plastilin]

The SSD mode works great with a few caveats.

For example? How to use standard nvme or ssd for persistent cache?