Quantum DLT 4000 Manual descarregar pdf (Página 248)

SCSI Commands

5-148 Quantum DLT 4000 Tape Drive

SEND DIAGNOSTIC Command (1Dh) (continued)

Two types 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:

1. Writes 500 32 KB records on track 0.

2. Rewinds the tape.

3. Reads the records.

4. Positions to the beginning of track 1.

5. Writes 500 32 KB records on track 1.

6. Repositions to the beginning of track 1.

7. Reads the records.

8. Rewinds the tape.

The execution time for this Level 2 test is approximately 6 minutes, if

calibration is not required. The test is specified by setting both the Selftst bit

and the UnitOfl bit to 1 and ensuring that the DevOfl bit is 0. The test can

accept a parameter list specifying test variables (shown in the following table).

If a parameter is specified, all parameters must be filled in and the parameter list

length should be set to 12. If these requirements are not met, an ILLEGAL

REQUEST is returned. The Selftst bit in this case must be 0.

1 2 ... 243 244 245 246 247 248 249 250 251 252 253 ... 299 300

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Quantum DLT 4000 Manual Página 248