FUJITSU C150-E049-02EN - Manual (Page 147)

3-114 M3099GX/GH OEM Manual
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 re-issued until some other status is
received.
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