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HSG80 ACS Solution Software V8.6 for IBM AIM Installation and Configuration Guide

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Table Of Contents
1–20 HSG80 ACS Solution Software Version 8.6 for IBM AIX Installation and Configuration Guide
For example:
In Figure 1–11, restricting the access of unit D101 to host 3, the host named BROWN can
be done by enabling only the connection to host 3. Enter the following commands:
SET D101 DISABLE_ACCESS_PATH=ALL
SET D101 ENABLE_ACCESS_PATH=BROWN1B2
If the storage subsystem has more than one host connection, carefully specify the access
path to avoid providing undesired host connections access to the unit. The default
condition for a unit is that access paths to all host connections are enabled. To restrict host
access to a set of host connections, specify DISABLE_ACCESS_PATH=ALL for the unit,
then specify the set of host connections that are to have access to the unit.
Enabling the access path to a particular host connection does not override previously
enabled access paths. All access paths previously enabled are still valid; the new host
connection is simply added to the list of connections that can access the unit.
IMPORTANT: The procedure of restricting access by enabling all access paths then disabling
selected paths is not recommended because of the potential data/security breach that occurs
when a new host connection is added.
Restricting Host Access by Offsets
Offsets establish the start of the range of units that a host connection can access.
For example:
In Figure 1–11, assume both host connections on port 2 (connections BLACK1B2 and
BROWN1B2) initially have the default port 2 offset of 100. Setting the offset of
connection BROWN1B2 to 120 will present unit D120 to host BROWN as LUN 0.
SET BROWN1B2 UNIT_OFFSET=120
Host BROWN cannot see units lower than its offset, so it cannot access units D100 and
D101. However, host BLACK can still access D120 as LUN 20 if the operating system
permits. To restrict access of D120 to only host BROWN, enable only host BROWN’s
access, as follows:
SET D120 DISABLE_ACCESS_PATH=ALL
SET D120 ENABLE_ACCESS_PATH=
BROWN1B2