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Solaris Multipathing How to Verify if ALUA Mode is Correctly Set (Doc ID 1485832.1)

Last updated on APRIL 29, 2024

Applies to:

Sun Storage Traffic Manager Software - Version 3.0 and later
Solaris x64/x86 Operating System - Version 9 and later
Solaris Operating System - Version 9 and later
Oracle Solaris on x86-64 (64-bit)
Oracle Solaris on SPARC (64-bit)


This document provide steps to verify that a storage array has ALUA mode correctly set, looking at the TPGS bits returned in the standard SCSI command INQUIRY.
Support of ALUA was introduced in Solaris 9 in patch 113039-18 and is natively available in Solaris 10 and above.


ALUA refers to Asymmetric Logical Unit Access which means that access characteristics of one port may differ from those of another port.


TPGS refers to Target Port Group Support, it is a method defined in the standard SPC-3 (and higher) for determining the access characteristics of a path to a logical unit through a target port.



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In this Document
 1. Introduction
 2. Retrieving the TPGS bits from scsi INQUIRY
 3. Example

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