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

Planning a Subsystem
1–15HSG80 ACS Solution Software Version 8.7 for Compaq OpenVMS Installation and
Configuration Guide
1–15
Using SWCC to Specify LUN ID Alias for a Virtual Disk
Setting a LUN ID alias for a virtual disk is the same as setting a unit identifier. To set
LUN ID alias for a previously created virtual disk perform the following procedure:
1. Open the storage window, where you see the properties for that virtual disk.
2. Click on the Settings Tab to see changeable properties.
3. Click on the “Enable LUN ID Alias” button.
4. Enter the LUN ID alias (identifier) in the appropriate field. It is strongly suggested
that, for simplicity, the LUN ID alias match the virtual disk number.
What is Selective Storage Presentation?
Selective Storage presentation is a feature of the HSG80 controller that enables the
user to control the allocation of storage space and shared access to storage across
multiple hosts. This is also known as Restricting Host Access.
In a subsystem that is attached to more than one host or if the hosts have more than
one adapter, it is possible to reserve certain units for the exclusive use of certain host
connections.
NOTE: The default condition is ENABLE_ACCESS_PATH=ALL. This specifies that access
paths to ALL hosts are enabled. StorageWorks recommends that the user restrict host access
and that the access path be carefully specified to avoid providing undesired host connections
access to the unit.
NOTE:
Restricting Host Access by Disabling Access Paths
If more than one host is on a link (that is, attached to the same port), host access can be
limited by enabling the access of certain host connections and disabling the access of
others. This is done through the ENABLE_ACCESS_PATH and
DISABLE_ACCESS_PATH switches of the
ADD UNIT (or SET unit) commands. The access
path is a unit switch, meaning it must be specified for each unit. Default access
enables the unit to be accessible to all hosts.