HSG80 ACS Solution Software Version 8.7 for Compaq Tru64 UNIX Installation and Configuration Guide

Planning a Subsystem
1–22 HSG80 ACS Solution Software Version 8.7 for Compaq Tru64 UNIX Installation and
Configuration Guide
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: 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 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 D120
D0 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