Hi Team,

I have an OpenStack Ceph cluster where the Cinder volumes pool uses a cache
pool named *volumes_cache*.

Due to performance issues, I observed that the cache pool has fewer PGs and
a high PG-to-object ratio, approximately 10x higher than normal. For
instance, one PG contains around 35,000 objects. I am planning to increase
the PG number for the cache pool.

For the base pool, I was able to increase the PG count without any issues.
However, for the cache pool, I encountered a warning indicating that a
force argument is required. In my lab environment, I found that changing
the cache pool mode to *none* allowed me to modify the PG number.

Since this is my production setup, I would like to know if there is a safe
and recommended procedure to increase the PG number of a *cache pool*
without impacting the environment.

Kindly advise on the best approach.

Thanks and Regards
Vishnu Bhaskar
Acceleron Labs Pvt Ltd
Bangalore, India
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