Compaq StorageWorks HSG60 ACS Solution Software V8.6 for Linux X86 and Alpha Installation and Configuration Guide

1–18 HSG60 ACS Solution Software Version 8.6 for Linux X86 and Alpha Installation and Configuration Guide
Restricting Host Access in Transparent Failover Mode
The following 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, controller A host port 1 and the controller B host port 1 share
a common Fibre Channel link. Controller A host port 2 and the controller B host port 2
also share a common Fibre Channel link. If the host 1 link is separate from the host 2 link,
the simplest way of limiting 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 1–9. This method applies only if the host 1 link and host 2 link are separate links.
NOTE: Compaq highly recommends that you provide access to only specific connections. That
way, if new connections are added, they will not have automatic access to all units. See the next
section Restricting Host Access by Disabling Access Pathsfor details.