Exabyte EXB-8205 Instrucciones de operaciones descargar pdf (Pagina 259)

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16.5 Receiving a Trace Dump

This section describes the steps and bit settings for receiving a trace

dump. Trace dumps are used for detailed fault analysis and include a

history of SCSI and servo command activity for the CTS.

To receive a trace dump, follow these steps:

1. Issue a SEND DIAGNOSTIC command with the SelfTest,

DevOfl, and UntOfl bits set to 0 and the MD bit set to 1. The

Parameter List Length field is ignored and can have any value.

2. Issue a RECEIVE DIAGNOSTIC RESULTS command with the

Allocation Length field set to 500h (1,280 bytes) and the TD bit

set to 1.

Note: To ensure that data in the trace dump is valid, be sure that the

CTS is reserved for the initiator’s exclusive use.

As shown in Table 16-5, 1,280 bytes of information are returned in the

trace dump.

Bytes... Contain this data...

0 to 255 SCSI Instruction Trace Table

256 to 511 SCSI State Trace Table

512 to 1,279 Servo Instruction, Status, Extended Status Tables

As described in the next section, you can use the SCSI instruction

trace table (bytes 0 to 255) to analyze SCSI command execution

sequences. Interpreting the other two sections of the trace dump

(bytes 256 to 1279), however, requires more sophisticated analysis

procedures that are beyond the scope of this manual.

Table 16-5 Bytes returned in a trace dump

May 1994 EXB-8205 and EXB-8505

(Standard and XL)

16-7

16 RECEIVE DIAGNOSTIC RESULTS (1Ch)

1 2 ... 254 255 256 257 258 259 260 261 262 263 264 ... 445 446

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Exabyte EXB-8205 Instrucciones de operaciones Pagina 259

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