SL24 - Unable to Complete Backups Via Legato

Asset ID:	1-72-1531237.1
Update Date:	2017-09-26
Keywords:

Solution Type Problem Resolution Sure

Solution 1531237.1 : SL24 - Unable to Complete Backups Via Legato

Applies to:

Sun StorageTek SL24 Tape Autoloader - Version Not Applicable and later
Information in this document applies to any platform.

Symptoms

Customer reporting they are unable to complete their backups running under Legato.

The SL24 has one drive only.

The SL24 dump log did not report any critical errors.

Cause

The SL24 log is showing both ports A and B Enabled. That means the library sees two host connected to the same library, which is not only not recommended but also not supported by Legato.

Solution

Following information taken from the SL24 log at the problem site:

Port A Settings     : Enabled          
Port name           : 500110A0008B2B6A  Topology            : auto
Loop-ID / AL_PA     : auto              Speed               : auto

Port A Status       : login complete   
Port name           : 500110A0008B2B6A  Speed               : 4 Gb/s
Topology            : point to point    N-Port ID           : 010700

Port B Settings : Enabled         
Port name           : 500110A0008B2B6B  Topology            : auto
Loop-ID / AL_PA     : auto              Speed               : auto

Port B Status       : login complete   
Port name           : 500110A0008B2B6B  Speed               : 4 Gb/s
Topology            : point to point N-Port ID           : 010700

Following information taken from an SL24 log not having the problem:

Port A Settings     : Enabled          
Port name           : 500110A0008CD7DA  Topology            : auto
Loop-ID / AL_PA     : auto              Speed               : auto

Port A Status       : logged out       
Port name           : 500110A0008CD7DA  Speed               : 4 Gb/s
Topology            : point to point    N-Port ID           : 920400

Port B Settings     : Enabled          
Port name           : 500110A0008CD7DB  Topology            : auto
Loop-ID / AL_PA     : auto              Speed               : auto

Port B Status : No light detected

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Disconnect one of the fiber cables that communicate between the host and the library. Retry the backups, and run the following commands in Solaris.

1. #cd /dev/rmt
2. #ls -l /dev/rmt/*cbn    ---you should show the link(s) for all /dev/rmt devices
3. #pwd   --make sure your under /dev/rmt
4. # rm *
5. #ls /dev/rmt ---you should have nothing listed.
6. #devfsadm
7.#ls -l /dev/rmt/*cbn    ---you should show the link(s) for /dev/rmt/.
8. Fix backup application to use the correct /dev/rmt/ device(s)

If it still does not work, try rebooting the library and restarting the server after disconnecting one of the cables.

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The above action resolved the issue.

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