
15-20
SCSI REFERENCE 1014826
CHAPTER 15—READ ELEMENT STATUS (B8h)
15.4 COMMAND STATUS
The library returns a status byte after processing the READ ELEMENT
STATUS command. This section describes when each type of status byte might
be returned.
Good
The library returns Good status when it is able to process the command
without errors.
Busy
Busy status indicates that the library is temporarily unable to accept a command
from this initiator. The initiator may retry the command later.
Reservation Conflict
The library returns Reservation Conflict status when it is reserved by a
different initiator. See Chapter 20 for more information about the RESERVE
command.
Check Condition
The library returns Check Condition status for the following reasons:
The command is issued to an invalid LUN.
A Unit Attention condition is pending for the initiator.
The library is not ready because a magazine is removed.
A reserved bit is set to 1 in the CDB.
A parameter in the CDB is invalid (see Table 15-3 for sense data).
Table 15-3 Invalid parameters in the READ ELEMENT STATUS CDB
Sense
Key
ASC ASCQ
SKSV
Bit
C/D
Bit
BPV
Bit
Bit
Pointer
Field
Pointer
Error
5h 21h 01h 1 1 0 0 0002h Invalid starting element address.
5h 24h 00h 1 1 1 — —
A reserved bit is set in the CDB. The
pointers point to the bit in error.
5h 24h 00 1 1 1 3h 0001h Invalid element type code.
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