HP StorageWorks HSG80 ACS Solution Software V8.8 for Tru64 UNIX Installation and Configuration Guide (AA-RV1VA-TE, March 2005)

Planning a Subsystem
49HSG80 ACS Solution Software V8.8 for Tru64 UNIX Installation and Configuration Guide
The command syntax to disable is:
HSG> SET this/other Default_Access=Disable
The command syntax to enable is:
HSG> SET this/other Default_Access=Enable {default after
upgrade}
When the command is invoked from one controller, the Default_Access from
the other controller will be similarly modified. The setting is symmetrical and
persistent across restarts, FRUTIL, etc.
Restricting Host Access in Transparent Failover Mode
Three methods can be used to restrict host access to storage units in transparent
failover mode:
■ Using separate Fibre Channel links (either loop or fabric)
■ Enabling the access path of selected host connections on a shared loop or
fabric
■ Setting offsets
Note: These techniques also work for a single controller.
Restricting Host Access by Separate Links
In transparent failover mode, host port 1 of controller A and host port 1 of
controller B share a common Fibre Channel link. Host port 2 of controller A and
host port 2 of controller B also share a common Fibre Channel link. If the host 1
link is separate from the host 2 link, the simplest way to limit host access is to
have one host or set of hosts on the port 1 link, and another host or set of hosts on
the port 2 link. Each host can then see only units assigned to its respective
controller port. This separation of host buses is shown in Figure 16. This method
applies only if the host 1 link and host 2 link are separate links.
Note: It is highly recommended that you provide access to only specific connections.
This way, if new connections are added, they will not have automatic access to all units.
See “Restricting Host Access by Disabling Access Paths” on page 50.