Comment 6 for bug 2040274

Ah, my apologies. I was misdirected by the other issue:
https://bugs.launchpad.net/charm-ceph-iscsi/+bug/2042419

The issue ignored the pool name specified and put the RBD image into the metadata pool.

So the metadata pool is used for rados objects for the gateway config file.

# rados --pool iscsi ls
gateway.conf

and the data pool is used for RBD.

# rados --pool ceph-iscsi ls
rbd_id.disk_1
rbd_directory
rbd_object_map.1a89963bcd7b
rbd_info
rbd_header.1a89963bcd7b

So setting "rbd" to the data pool is correct, but to the metadata pool wasn't precise in the end.