Adaptec DuraStor 6200SR User Manual page 54

To run two controllers in active-active mode, the following must
be true:
– You must have two controllers installed in a proper
configuration.
– Both controllers must be loaded with compatible firmware
levels. The system automatically detects firmware
incompatibilities and halts the boot of the second controller.
– The operating mode of each controller must be set to active-
active. See
– Host channel 0 of each controller must be set to a different ID
only if you are using a single host interface. If you are using
two host connections, then each controller's host channel 0
can have the same ID.
Stand-alone dual-port—A single controller operating with two
I
host ports. This mode allows the host to achieve greater
throughput by balancing I/O operations across the two host
ports. Host port fault tolerance is also achieved, because the host
can continue to access the controller if one host channel fails.
The same LUNs display on the two separate host ports.
Caution: The host OS and disk drivers must support dual-
!
port accesses for this mode to be used effectively. If the
host system does not support dual-port access, do not
configure the controller in dual-port mode—the OS may
believe that a single LUN is really two independent arrays,
which may result in data corruption.
Stand-alone single-port—A single controller operating with
I
one host port and three disk channels. Use this mode if you do
not want to run in dual-port mode, or if your host OS does not
support it.
Note: If you select stand-alone single-port mode, SCSI
channel 3 will not be available if it has been disabled in the
Flash Utility.
Changing the Operating Mode on page
Configuring the RAID Controller
5-8.
5-7