Hello Gonçalo,
Thanks for your reminding. I was just setting up the cluster for test, so don't worry, I can just remove the pool. And I learnt that since the replication number and pool number are related to pg_num, I'll consider them carefully before deploying any data.
Hi Zhang...
If I can add some more info, the change of PGs is a heavy operation, and as far as i know, you should NEVER decrease PGs. From the notes in pgcalc ( http://ceph.com/pgcalc/):
"It's also important to know that the PG count can be increased, but NEVER decreased without destroying / recreating the pool. However, increasing the PG Count of a pool is one of the most impactful events in a Ceph Cluster, and should be avoided for production
clusters if possible."
So, in your case, I would consider in adding more OSDs.
Cheers
Goncalo
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