Compaq HSZ80 manual Multiple-Bus Failover Mode, 32Configuring Storagesets

4–32Configuring 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.