Description of problem:

In all nodes upgrade procedure, there is a section asking to remove iscsi kernel module :

Remove the iSCSI module from the Linux kernel:
# modprobe -r iscsi

It is not clear the purpose of this step, I suggest explaining the region for the kernel module removal.

Version-Release number of selected component (if applicable):

RHCS 4 installation docmantation 

Remove the iSCSI module from the Linux kernel:
https://access.redhat.com/documentation/en-us/red_hat_ceph_storage/4/html-single/installation_guide/index#manually-upgrading-ceph-monitor-nodes-and-their-operating-systems_install

section 8