Thanks, Ilya.
First, I was not sure whether to post my question on @
ceph.io or @
lists.ceph.com (I subscribe to both) -- should I use @
ceph.io in the future?
Second, thanks for your advice on cache-tiering -- I was starting to feel that way but always good to know what Ceph "experts" would say.
Third, I tried enabling (and setting) the pool application commands you outlined but got errors (Ceph is not allowing me to enable/set application on the cache tier)
$ ceph osd pool application enable cephfs-data-cache cephfs
Error EINVAL: application must be enabled on base tier
$ ceph osd pool application set cephfs-data-cache cephfs data cephfs_test
Error EINVAL: application metadata must be set on base tier
Since at this point, it is highly unlikely that we will be utilizing cache-tier on our production clusters, and there is a work around it (by manually creating a CephFS client key), this is nothing serious or urgent; but I thought I should let you guys know.
Again, thanks for your help!