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4–30 Configuring Storagesets
Designating the Port and Designating the Host SCSI ID
Number
Using a two-step process, port access can be combined with shared host access on the
same bus further restricting one host from accessing another host’s units. You start by
assigning units on a port using the SET THIS PORT_n_ID command, followed by
restricting access between hosts on the same host SCSI bus using the
DISABLE_ACCESS_PATH and ENABLE_ACCESS_PATH switches.
Example
In Figure 4–4, two Windows NT hosts are connected to Port 1 on the same host bus
and a DIGITAL UNIX host is connected to Port 2 on a separate SCSI host bus.
Because all targets default to Host Mode A—which includes DIGITAL UNIX—you
only need to set targets to other host operating systems, such as Windows NT.
Units D100 and D101 have been assigned to Port 1 and SCSI ID 7, a Windows NT
host. Units D102, D103, and D104 have been assigned to Port 1 and SCSI ID 6,
another Windows NT host. Units D200 and D201 have been assigned to Port 2, the
DIGITAL UNIX host.
NOTE: By default, units are enabled for all SCSI ID numbers. You must first disable
the unit for all SCSI ID numbers, followed by enabling the unit for a specific host
SCSI ID number.
NOTE: Figure 4–4 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
.