Adaptec 412R User Guide - Page 138

failover would be transparent to the hosts as far as the number

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DuraStor 412R/6320SS/7320SS Installation and User's Guide In this case, there would be an advantage to configuring the controllers in active-active dual-port mode, because of increased connectivity. However, the host driver software would need to handle the fact that each LUN would appear twice in the SAN fabric, and that one image of the LUNs would disappear if one controller failed. Depending on the host software being used, it may be more desirable to run in active-active single-port mode, since a controller failover would be transparent to the hosts (as far as the number of LUN images and the port WWNs attached to the LUNs). The advantages of using a switch is that the two hosts each have a direct path to a controller port and don't have to compete for access on the same loop. B-8

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B-8
DuraStor 412R/6320SS/7320SS Installation and User’s Guide
In this case, there would be an advantage to configuring the
controllers in active-active dual-port mode, because of increased
connectivity. However, the host driver software would need to
handle the fact that each LUN would appear twice in the SAN
fabric, and that one image of the LUNs would disappear if one
controller failed.
Depending on the host software being used, it may be more
desirable to run in active-active single-port mode, since a controller
failover would be transparent to the hosts (as far as the number of
LUN images and the port WWNs attached to the LUNs). The
advantages of using a switch is that the two hosts each have a
direct path to a controller port and don’t have to compete for access
on the same loop.