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4–26 Configuring Storagesets
Transparent Failover Mode
In transparent failover mode, units can be assigned to a host in a variety of setups,
including these three common ways:
■ by designating the port of the controller, either Port 1 or Port 2 or both.
■ by designating the host SCSI ID number of the hosts configured on a shared bus.
■ by designating the port of the controller and by designating the host SCSI ID
number of the hosts configured on a shared bus.
Designating the Port
The HSZ80 Array Controller has two host ports where separate hosts can then be
attached to the controller through separate buses. Units can be assigned to either port,
depending on their target ID and by setting PORT_1_ID and PORT_2_ID.
The configurations best suited to using the PORT_n_ID switch and separate SCSI
buses include the following:
■ Separate operating systems accessing units on the same pair of HSZ80 Array
Controllers.
■ The same operating systems (nonclustered, only) accessing units on the same
pair of HSZ80 Array Controllers.
■ Any environment in which multiple hosts access the pair of HSZ80 Array
Controllers, but where a specific host must have sole access to units.
Example
In Figure 4–2, a Windows NT host is connected to Port 1 while a DIGITAL UNIX
host is connected to Port 2. Targets 1 and 2 (D100 and D200) have been assigned to
Port 1 and targets 3 and 4 (D300 and D400) have been assigned to Port 2.
NOTE: Figure 4–2 shows an example of a heterogeneous host configuration. For
supported host operating systems, refer to the
HSZ80 Array Controller ACS
Version 8.3 Release Notes
.