Specifications

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Compaq HSG80 Array Controller ACS Version 8.4 Configuration and CLI Reference Guide
Multiple-Bus Failover
If SET MULTIBUS_FAILOVER is enabled, all ports will be able to see and access
the CCL. In addition, the CCL appears to the host as a direct access device.
IMPORTANT: A port will not be able to see the CCL if a host communication has
a unit offset higher than the location of the CCL.
Transparent Failover
If you are in SCSI-2 mode and have enabled the SET FAILOVER command, only one
CCL will be enabled. Either host port 1 or host port 2 will see it, but not both.
SCSI-3 Mode
In SCSI-3 mode, the CCL is automatically enabled and cannot be disabled. The CCL
will appear at unit 0 of each unit offset.
Multiple-Bus Failover
If you are in multiple-bus failover mode, all ports will be able to see and access the
CCLs. As a result, all hosts will have access to each CCL, and they will appear to the
host as array controllers.
IMPORTANT: A host outside of the CCL range will not be able to see the CCL.
Transparent Failover
If you are in transparent failover mode, each CCL will be accessible from the port that
has the unit offset enabled. Ports with multiple unit offsets assigned will have multiple
CCLs, and they will appear to the host as an array controller.