Hitachi HUS154530VLF400 User Manual

Page of 417
Hitachi Ultrastar 15K450 (FC-AL) Hard Disk Drive Specification
318   
The unit attention condition persists for each initiator until that initiator clears the condition from the logical unit as described 
below. Several commands are handled as special cases during a unit attention condition These cases are also discussed below. 
If the target receives a command from an initiator before reporting a CHECK CONDITION status for a pending unit attention 
condition for that initiator, the target's response varies with the command as follows: 
 Inquiry
Execute the command, return GOOD status, and preserve the unit attention condition.
 Report 
Luns
Same as above
 Request 
Sense
Execute the command, return any pending sense data, return GOOD status, and preserve the unit 
attention condition. If there is not any pending sense data, the sense data associated with the highest 
priority unit attention condition is returned and the highest priority unit attention condition is 
cleared for this initiator. 
 All 
Others
Do not execute the command, return a CHECK CONDITION status, clear the highest priority unit 
attention condition for this initiator and return the associated sense data. 
More than one unit attention condition may be generated for an initiator before that initiator clears the unit attention condition.