Chapter 4 - SAN Solution Strategies
Active-Active:Single Port Mode for SAN
77
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.
4100FS.book Page 77 Tuesday, July 8, 2003 4:35 PM
Summary of Contents for 4100FS
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