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4–32 Configuring Storagesets
To assign the units to one of the Windows NT hosts using SCSI ID numbers, yet
restrict the other Window NT host’s access, use the following syntax:
SET D100 DISABLE_ACCESS_PATH = ALL
SET D100 ENABLE_ACCESS_PATH = 7
SET D101 DISABLE_ACCESS_PATH = ALL
SET D101 ENABLE_ACCESS_PATH = 7
SET D102 DISABLE_ACCESS_PATH = ALL
SET D102 ENABLE_ACCESS_PATH = 6
SET D103 DISABLE_ACCESS_PATH = ALL
SET D103 ENABLE_ACCESS_PATH = 6
SET D104 DISABLE_ACCESS_PATH = ALL
SET D104 ENABLE_ACCESS_PATH = 6
Multiple-Bus Failover Mode
Multiple-bus failover is a dual-redundant controller configuration where each
controller in a controller pair has its own connection to the host. In such a dual-
redundant configuration, units can be made available on both ports of the controller
pair. Regardless of which controller a host is using, that host will always have access
to its units while also being restricted from accessing other hosts’s units. The
command that limits host access is THIS_PORT_n_ENABLE_ACCESS_PATH.
Example
In Figure 4–5, a Windows NT host and a DIGITAL UNIX host are connected to a
dual-redundant pair of HSZ80 Array Controllers in multiple-bus failover mode. Each
host has two host port controllers. One host port is connected to controller A and the
other host port is connected to controller B. All commands are entered from
controller A.