Fujitsu MAU3036NC/NP Manual do Utilizador descarregar pdf (Página 113)

C141-E205 7-1

CHAPTER 7 ERROR ANALYSIS

7.1 Error Analysis Information Collection

7.2 Sense Data Analysis

This chapter explains in detail how sense data collected from a disk drive is used for troubleshooting. Sense

data reflects an error in the disk drive, and helps with troubleshooting.

A sense key, additional sense code, and additional sense code qualifier, taken from various sense data are

repeated. Also in this chapter, troubleshooting is performed using these three codes. Unless otherwise

specified, "sense data" means the above three codes. When sense data is represented as (x-xx-xx), the

leftmost x is a sense key, the middle xx is an additional sense code, and the rightmost x is an additional

sense code qualifier.

7.1 Error Analysis Information Collection

7.1.1 Sense data

When IDD posts a CHECK CONDITION status or detects a fatal error in the SCSI bus, the current

command or queued command is cleared. In such a case, the IDD generates sense data about the

command-issuing INIT. The INIT can read the sense data by issuing a REQUEST SENSE

command.

Even if a transfer byte length that is shorter than the sense data length of the tested device is

specified, the command terminates normally. In this case, however, the INIT receives part of the

sense data, but the remaining part of the sense data is lost.

For details of the REQUEST SENSE command, refer to Subsection 3.1.15 “REQUEST

SENSE(15)” in the SCSI Logical Interface Specifications.

7.1.2 Sense key, additional sense code, and additional sense code qualifier

If an error is detected in a disk drive, the error status is indicated in the sense data collected from

the disk drive. Figure 7.1 shows the positions of a sense key, additional sense code, and additional

sense code qualifier.

1 2 ... 108 109 110 111 112 113 114 115 116 117 118 ... 129 130

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Fujitsu MAU3036NC/NP Manual do Utilizador Página 113