Indicates the requested mode for a given port pair. A value
of 1 indicates a request for SAS(M) for the corresponding pair.
A value of 2 indicates SAS(S) and a value of 3 indicates DAS.
It should be noted that if requested mode is different than
current mode a reboot is required to enable the requested mode.
NOTE: reboot can be accomplished using a3ComSysSystemAction.