HSG80 ACS Solution Software V8.6 for Windows NT and Windows 2000 Installation and Configuration Guide

Planning a Subsystem 1–23
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 1–13. 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. This
way, if new connections are added, they will not have automatic access to all units. See the
following section Restricting Host Access by Disabling Access Paths.
Figure 1–13. Limiting host access in transparent failover mode
CXO7081B
Host
port 1
active
Host
port 2
active
D100 D101 D120D0 D1
Switch or hub Switch or hub
Controller A
Controller B
Connection
AQUA1A1
Connection
BLACK1B2
Connection
BROWN1B2
Host
port 2
standby
Host
port 1
standby
Host 1
"AQUA"
FCA1
Host 2
"BLACK"
FCA1 FCA1
Host 3
"BROWN"
NOTE: FCA = Fibre Channel Adapter