![background image](http://html1.mh-extra.com/html/quantum/dlt1-vs80-scsi/dlt1-vs80-scsi_interface-manual_770515153.webp)
DLT1/VS80 SCSI Interface Guide
81-81276-01 Rev A01
July 2004
4-111
4.21 SEND DIAGNOSTIC (1Dh)
The SEND DIAGNOSTIC command tells the tape drive to perform diagnostic tests on itself.
Figure 4-72.
SEND DIAGNOSTIC (1Dh) Command Descriptor Block — Data Format
The tape drive does not support the Page Format field; it must remain 0.
Two separate types of unit resident tests can be accessed:
•
Electronics Self-Test (Level 1 test)
–
To invoke the diagnostic, a good portion of the controller
hardware and software must be functioning properly. The premise this test is based on is that full
power-on testing is not necessary. Therefore, this test performs an extension of the power-on self
tests. The code ROM EDC is verified and two queues used by much of the controller software are
checked by dequeuing and enqueuing items.
If there is a loader attached, a software reset is performed on it. This test does not attempt to write
data to or read data from media. When complete, the test posts any errors in the extended Sense
Data bytes. This test has an execution time of approximately 5 seconds.
This test is specified by setting just the Self-Test bit (DevOfl, and UnitOfl both remain 0).
•
Write/Read Functionality Test (Level 2 test) – The default version of this test does the following:
Writes 500 32 KB records on track 0.
Rewinds the medium.
Reads the records.
Positions to the beginning of track 1.
Writes 500 32 KB records on track 1.
Repositions to the beginning of track 1.
Bit
Byte
7
6
5
4
3
2
1
0
0
Operation Code (1Dh)
1
Logical Unit Number
PF
Rsv’d
SelfTst
DevOfl
UnitOFl
2
Reserved
3 - 4
(MSB)
Parameter List Length
(LSB)
5
Unused
Reserved
Flag
Link
Summary of Contents for DLT1/VS80 SCSI
Page 1: ...DLT1 VS80 SCSI Interface Guide...
Page 6: ...DLT1 VS80 SCSI Interface Guide vi July 2004 81 81276 01 Rev A01 Notes...
Page 12: ...Table of Contents xii July 2004 81 81276 01 Rev A01 Notes...
Page 16: ...List of Figures xiv July 2004 81 81276 01 Rev A01 Notes...
Page 20: ...List of Tables xviii July 2004 81 81276 01 Rev A01 Notes...
Page 24: ...Chapter 1 Introduction 1 4 July 2004 81 81276 01 Rev A01 Notes...
Page 32: ...Chapter 2 General SCSI Bus Operation 2 8 July 2004 81 81276 01 Rev A01 Notes...
Page 42: ...Chapter 3 SCSI Messages 3 10 July 2004 81 81276 01 Rev A01 Notes...
Page 181: ......