Fujitsu MAY2036RC User Manual download pdf (Page 79)

C141-E230 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 HDDs post a CHECK CONDITION status, the current command or queued command is

cleared. In such a case, the HDDs generate sense data about the command-issuing INIT. The INIT

can read the sense data by reading the sense data added to the response frame of the command where

an error occurred (Auto Sense function).

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 ... 74 75 76 77 78 79 80 81 82 83 84 ... 93 94

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Fujitsu MAY2036RC User Manual Page 79