Fujitsu MBA3147NC 用户手册

 

 
 
 
 
 
This chapter explains in detail how sense data collected from an HDD is used for troubleshooting.  Sense 
data reflects an error in the HDD, and helps with troubleshooting. 

 

When HDD 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 HDD generates sense data 
about the command-issuing initiator.  The initiator can read the sense data by issuing a REQUEST 
SENSE command. 

 

This HDD is equipped with sense data with a byte length of 48.  Accordingly, Fujitsu 
recommends collecting all 48-byte sense data when the host unit collects sense data. 

 

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 REQUEST SENSE command, refer to Subsection 3.1.15 “REQUEST SENSE 
(15)” of the SCSI Logical Interface Specifications. 

 

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. 

 

Figure 7.1 shows the sense data format. 

C141-E270 

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