CMMVC8994E The maximum number of hosts for one or more IO groups is already configured.
Explanation
You must remove at least one host I/O group pair definition from the I/O group that you have specified before you can resubmit the command.
User response
Determine whether the action is required.
If the action is required, review the current configuration to determine whether any current host I/O group pair definitions for the I/O group that you have specified are not required. Remove at least one host I/O group pair definition that is not required from the I/O group that you have specified, and resubmit the command.