T10000/9x40 - How To Determine If The Drive Experianced A SNO Condition

Asset ID:	1-71-2168135.1
Update Date:	2017-09-26
Keywords:

Solution Type Technical Instruction Sure

Solution 2168135.1 : T10000/9x40 - How To Determine If The Drive Experianced A SNO Condition

Applies to:

Sun StorageTek T10000 Tape Drive - Version All Versions and later
Sun StorageTek 9840 Tape Drive - Version Not Applicable and later
Sun StorageTek 9940 Tape Drive - Version Not Applicable and later
Information in this document applies to any platform.

SNO = Should not occur.
VOP = Virtual Operator Panel

Goal

Define what a SNO is and what should be done when one occurs.

Solution

When the drive microcode determines that it is having problems to the point that it cannot continue is will force the drive to SNO which stands for Should Not Occur. When this occurs the drive collects information about the current state and creates a dump in the drive EEPROM. The SNO will have a particular error code called a Fault Symptom Code (FSC) that is useful in troubleshooting the problem. After the dump is collected the drive will be re-booted. The drive will come up in the Online state after the reboot.

Symptoms that a SNO has occurred:

1. The host and library will lose communication with the drive until the reboot has completed.

You may see the following on the drive display if connect to the drive with VOP:

1. If no tape has been loaded in the drive since the SNO occurred you will see dmp x yyyy on the display. (Where x is the latest dump number and yyyy is the FSC for the dump).

2. If one or more tapes have been loaded on the drive since the SNO then the display will be normal. Try to retrieve the dump (using VOP) to see if one is present. If no dump is present in the drive then you will have a zero byte dump file.

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