Fujitsu MAX3036FC Manual Do Utilizador

C141-E234 

7-1 

 

 
 
 
 
 
 
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 

 When 

the HDD posts a CHECK CONDITION status or detects a fatal error in the loop, the current 

command or queued command is cleared.  In such a case, the HDD generates sense data about the 
command-issuing initiator.  The initiator 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), or 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 initiator receives part of the 
sense data, but the remaining part of the sense data is lost. 

 

For details of the Auto Sense function, refer to Section 2.6 “Sense Data Hold State” of the Fibre 
Channel Interface Specifications. 

 

For details of the REQUEST SENSE command, refer to Subsection 4.1.14 “REQUEST SENSE 
(15)” of the Fibre Channel Interface Specifications. 

 

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.