CMMVC8915E Changing the IP address attributes may cause mdisks to go into a degraded state for some time.

Explanation
If a source IP address is in use for backend controller connectivity, changing the IP address,
mask, or gateway causes the existing sessions to be removed and new sessions to be established.
During this phase, the managed disks that are visible though the source port that is being
reconfigured go into a degraded state until the new sessions are established. 

User response
If you did not intend to reconfigure, reenter the command with the correct parameters. If you do
want to reconfigure, an administrator can use the management GUI or the cfgportip
command with the -force flag to go ahead with the reconfiguration. Even if no
IP address is already assigned to the port that you are trying to use for the
cfgportip command, use the -force flag. No sessions are
disconnected because no sessions exist.