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SEND DIAGNOSTIC Command (1Dh) SDLT 600 SCSI Interface Guide

4-234 January 2005 81-81200-02 REV A01

4.31.1 Level 1 Test: Electronics Test

Running a Level 1 test requires that a major portion of the controller hardware and software be

functioning properly. The Level 1 test is based on the premise that full power-up testing is not

necessary; therefore, it is an extension of the power-on tests that the drive runs. The test verifies the

controller software Error Detection Code (EDC) and checks one queue that much of the controller

software uses by dequeuing and enqueuing items. The test also runs a cache memory test. Finally, this

test checks the status of the servo subsystem by sending a STATUS command to the servo and

interpreting the results.

The Level 1 test does not attempt a WRITE or READ to or from the tape medium. If an error occurs

during the Level 1 test, the drive reports a CHECK CONDITION status to the host. The host must then

issue a REQUEST SENSE command to get the information describing the failure. When complete, the

drive reports any errors that occurred in the extended Sense Data bytes.

The Level 1 test has an execution time of approximately 5 seconds. See Table 4-136 on page 4-235 for

information on setting the SEND DIAGNOSTIC CDB fields to select a Level 1 test.

4.31.2 Level 2 Test: Write / Read Functionality Test

The Level 2 test performs the following actions:

1. Writes two tracks of data, one in each direction.

2. Rewinds the tape.

3. Reads the two tracks of data.

4. Rewinds the tape.

The execution time for the Level 2 test is approximately 12 minutes. See Table 4-136 on page 4-235

for information on setting the SEND DIAGNOSTIC CDB fields to select a Level 2 test.

The Level 1 and Level 2 diagnostic tests do not take parameters. Specifying parameters causes the

drive to return CHECK CONDITION status with Sense Key set to ILLEGAL REQUEST.

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Quantum 1200 Series DAT Autochanger Podręcznik Użytkownika Strona 276