Compaq HSZ80 manual Transparent Failover Mode, Designating the Port, 26Configuring Storagesets

4–26Configuring 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 4–2shows an example of a heterogeneous host configuration. For supported host operating systems, refer to the HSZ80 Array Controller ACS Version 8.3 Release Notes.