Phase' #21 Scsi Interactive Tape Test - AT&T 3B2 Off-Line Diagnostic Manual

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Phase' #21
Phase Name:
Type:
Function:
Tests:
Time:
Warnings:
Notes:
Phase #21 Tests
SCSI Interactive Tape Test
SCSI Interactive Tape Test
Interactive
This phase resets the SCSI bus, causing the target controllers to initiate any
reset diagnostics. Basic commands are sent to the target controllers to establish
sanity and identification.
Test 1 - checks for incorrect cabling and termination.
Test 2 - checks for a minimum of at least one target controller.
Test 3 - verifies that the Host Adapter ID is different from all target controller
IDs.
Test 4 - verifies that at least one LV is associated with a target controller.
Test 5 - verifies that tape unit can be written to and read from.
180 seconds
The configuration of the SCSI bus is displayed during this phase. You must
verify that the display is correct. The diagnostics only exercise what the system
believes is associated with the SCSI system.
None
Test Number: 1
Function: This test checks for incorrect cabling and termination.
Procedure: Clear the SCSI Bus Reset latch.
Hardware Tested: The cabling and bus terminator are tested.
Data Returned: If this test fails, the message "Reset Error: possible SCSI bus cable or
termination problem" is displayed on the system console.
Test Number: 2
Function: This test verifies that the Host Adapter Identification (ID) is different from that
of all target controllers.
Procedure: A command is sent to the Host Adapter.
Hardware Tested: All of the target controllers on the bus are tested.
Data Returned: If this test fails, the message" Error: Host Adapter Target ID match at ID xx" is
displayed on the system console.
SMALL COMPUTER SYSTEM INTERFACE DIAGNOSTICS 14-39