Table of Contents
Advertisement
7. Diagnostics
7. 1. 2 SEND DIAGNOSTIC command - Self Test
The host computer can request that the drive perform a Self Test on itself to verify that it is functioning normally. The
Self Test bit in the SEND DIAGNOSTIC command is set to one, and the Parameter List Length is zero. This initiates the
Self Test Diagnostic which is similar to the Power-on self test except that non-destructive RAM testing is substituted for
the destructive RAM tests.
If an error is detected during this test, the drive will return CHECK CONDITION status to the host. The host shall issue
a REQUEST SENSE command to determine the cause of the CHECK CONDITION status. The Sense data returned by
the drive will have a Sense Key of 4 (Hardware Error) and the ASC/ASCQ will be 44 00 (Internal Target Failure). The
host can then issue a RECEIVE DIAGNOSTIC RESULT command to the drive in order to identify the specific diagnos-
tic test that failed and the failure error code.
The drive should be checked by a qualified person to determine what action should be taken.
7. 1. 3 SEND DIAGNOSTIC command - Individual Test
The SEND DIAGNOSTIC command also provides the capability to run each of the diagnostic tests individually. In
order to identify the diagnostic test to be executed, the SEND DIAGNOSTIC command should be configured as fol-
lows:
Self Test bit = 0
Device Offline bit = 0
Unit Offline bit = 1
Parameter List Length = 5 or 9 (see below)
The SDT-10000/SDT-11000 supports both the SCSI-1 and SCSI-2 implementations of the SEND DIAGNOSTIC com-
mand.
In the SCSI-1 mode, the Page Format (PF) bit is zero and the Parameter List Length is 5, the Parameter List in this case
is 5 bytes long and will be of the form:
Bit
7
Byte
0
1
Break
2
3
4
7 - 2
SONY SDT-10000/SDT-11000 DDS Tape Drive
6
5
Diagnostic Test Number
Table 7-1: SEND DIAGNOSTIC Parameter - SCSI-1
4
3
Loopcount
Parameter A
Parameter B
Parameter C
2
1
0
Advertisement
Chapters
Table of Contents
