User's Guide

Chapter 3 Emulated DLT7000 SCSI Commands
Send Diagnostic (1Dh)
Quantum DX-Series Software Interface Guide 259
Two levels of unit-resident diagnostic tests can be accessed:
Electronics Self-Test (Level 1 Test)
To invoke this level of diagnostic test, a major portion of the controller
hardware and software must be functioning properly. The test is based
on the premise that full power-up testing is not necessary, therefore, it is
an extension of the power-up self tests that are run. The code ROM EDC
is verified, two queues used by much of the controller software are
checked by dequeuing and enqueuing items.
If a loader (Medium Changer) is configured, the test attempts a software
reset on the loader. This test does not attempt a WRITE or READ to or
from the tape medium. When complete, any errors that occur are
reported in the extended Sense Data bytes. This Level 1 test has an
execution time of approximately five (5) seconds.
• Specify the Electronics Self-Test by setting the Selftst bit to 1, and
both the DevOfl and UnitOfl bits to 0.
• Read / Write Functionality Test (Level 2 Test)
• The default version of this test does the following:
• Writes 500 32 KB records on track 0 (forward motion)
•Rewinds the tape.
•Reads the records.
• Positions to the beginning of track 1 (backward motion)
• Writes 500 32 KB records on track 1.
• Repositions to the beginning of track 1.
•Reads the records.
• Rewinds the tape.
The execution time for this Level 2 test is approximately 6 minutes, if
calibration is not required. Specify the Read/Write test by setting both
the Selftst bit and the UnitOfl bit to 1 and ensuring that the DevOfl bit to
0.
A level III (or test type III) is available with user defined parameters.
Tech Tip: This command will accept any correctly formatted
command and return a good status.