Appendix A: Logs

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Update logs

Update Logs record firmware changes and upgrades in the autoloader. An

Update Log also records when hardware is updated or changed.

Boot logs

Boot logs keep track of the boot status in terms of number of hours the autoloader has been powered on, the number of times the autoloader has been rebooted, and the reason for the reboot.

Tape drive logs

Tape drive error logs

The tape drive generates six types of logs. For troubleshooting errors, you should only use the SCSI Check Condition Error log.

Partial information about tape drive error logs can be retrieved from SCSI. All tape drive error logs contain three main fields: Event Log Number, Event Number or Name, and POH/PC.

Field

Description

 

 

Event Log Number

A sequence number that indicates the order in which the event was logged.

 

 

Event Number or Name

This field appears in every event log, but varies depending on the event type. This

 

field indicates the type of log.

 

 

POH/PC

The tracking information for how many power-on-hours (POH) the drive has had

 

since it was shipped. This is how many hours the drive has had power applied

 

regardless of the number of times it is turned on and off. POH is updated once every

 

60 minutes that the drive has had power applied to it without interruptions.

 

Power cycles (PC) is how many times the drive has experienced a power-on cycle.

 

Each time a drive logs a Hard Event, it increments this count as well.

 

 

In addition to these main fields, each type of log contains specialized fields.

SCSI check condition error logs

SCSI Check Condition Error logs record SCSI events that are sent to the host when a command fails. These logs may be related to the events logged previously, indicating that the event created a check condition that the host should know about.

Field

Description

 

 

Media ID (MID)

A Media ID which is an internal identification number, written to the media the first

 

time the media is used, to aid in tracking the media to the different events. This

 

ID does not correlate to any media ID used by application software.

 

 

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