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Troubleshooting Disk Issues: How to Use the LUN GUID or LUN ID to Search for LUN Errors (Doc ID 2771334.1)

Last updated on OCTOBER 05, 2022

Applies to:

Solaris Operating System - Version 10 to 11.4 [Release 10.0 to 11.0]
Information in this document applies to any platform.


A disk is the term we use to refer to a physical (hardware) disk drive.
A LUN (Logical Unit Number) ID refers to one or more disks that are configured together to form a single addressable device -i.e. when creating
RAID (Redundant Array of Independent Disks) mirrors, stripes, raid-5, etc..
A LUN GUID (Globally Unique IDentifier) is generated by the intelligent storage array when the LUN is created.
A LUN's GUID, as the name implies, uniquely identifies the LUN and its properties.
The  LUN GUID remains the same - even if the LUN is shared on multiple servers and on different operating systems.

In Solaris, the LUN GUID is used to refer to the LUN - in /var/adm/messages file, FMA, prtconf, prtpicl, etc.
Solaris does not use the LUN CTD ( controller_target_drive-number) for logging.

How do you find the LUN GUID?
How do you use it for troubleshooting?



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