TEST UNIT READY (3):
This TEST UNIT READY command is used to see if the UNIT ATTENTION condition or other error was successfully cleared. In some special cases, another error may have been nested with the UNIT ATTENTION and this TEST UNIT READY command may also return CHECK CONDITION status.
REQUEST SENSE (4):
This REQUEST SENSE command is used to determine which error or exception was associated with the CHECK CONDITION status returned by the TEST UNIT READY (3) command. In addition, this REQUEST SENSE command is used to clear the outstanding CHECK CONDITION. This may be a NOT READY sense key or another unexpected error.
TEST UNIT READY (5):
This TEST UNIT READY command is used to see if all outstanding CHECK CONDITION statuses have finally been cleared. If so, the logical unit is identified as ready.
REQUEST SENSE (6):
This REQUEST SENSE command is used to determine why there is a persistent CHECKCONDITION status. If the sense key indicates some other failure, the logical unit is identified as failing and the sense key is logged in the appropriate area. IMPLEMENTORS NOTE: Commands that receive BUSY or RESERVATION CONFLICT status should be
M3099GX/GH OEM Manual |