Reference Guide

Chapter 2 Task Management
Task Management Function
DLT-S4 Interface Reference Guide 7
Task Management Function 2
There are three types of Task Management:
•Reset
• TARGET RESET
• LOGICAL UNIT RESET
•Abort
• ABORT TASK SET
• ABORT TASK
• CLEAR TASK SET
•Query
• QUERY TASK
TARGET RESET 2 An initiator sends the TARGET RESET request to direct the tape drive to
clear all I/O processes. This task management function causes the drive
to:
1 Abort all the commands in the task set without sending status and
flush all of the complete blocks in the cache to tape.
2 Execute a soft reset.
The drive creates a Unit Attention condition for all initiators after
accepting and processing a
TARGET RESET request. The additional sense
code is set to
TARGET RESET OCCURRED.
If a
WRITE command is in progress and STATUS has not been sent to the
initiator when the drive receives this message, the drive may write some
or all of the data for the
WRITE command to the medium.
LOGICAL UNIT RESET 2 This task management function causes the drive to reset the selected unit.
When the LUN is set to 0 and the drive receives the
LOGICAL UNIT RESET
task management function, the drive is reset as described in TARGET
RESET
above.