User Manual

SCSI Commands Reference Manual, Rev. J 69
www.seagate.com Direct Access Block commands (SPC-5 and SBC-4)
3.2 CHANGE DEFINITION command
This command has been declared obsolete by the T10 committee. However, it is included because it may be implemented on
some products.
The CHANGE DEFINITION command (see table ) is used to modify the operating definition of the device server(s) with respect to
commands from the sending initiator or with respect to commands from all initiators.
If reservations are active, they shall affect the execution of the CHANGE DEFINITION command as follows. If the SCSI device does
not allow different operating definitions for each initiator, a reservation conflict shall occur when a CHANGE DEFINITION
command is received from an initiator other than the one holding a logical unit reservation. If any initiator has an extent or
element reservation on an SCSI device, no other initiator may affect the operating definition of the initiator holding the
reservation by use of the CHANGE DEFINITION command.
SAVE bit
0 A save control bit (SAVE) of zero indicates that the device server shall not save the operating definition.
1 A Save bit of one indicates that the device server shall save the operating definition in non-volatile memory.
The definition parameter field is defined in Table 34.
Table 34 Definition parameter field
The current operating definition parameter values establish operating definitions compatible with the applicable SCSI standard.
Table 33 CHANGE DEFINITION command
Bit
Byte
7 6 5 4 3 2 1 0
0
OPERATION CODE (40h)
1
Reserved
2
Reserved SAVE
3
Reserved DEFINITION PARAMETER
4
Reserved
5
Reserved
6
Reserved
7
Reserved
8
PARAMETER DATA LENGTH
9
CONTROL
Value Meaning of definition parameter
00h Use current operating definition
03h SCSI-2 operating definition
04h SCSI-3 operating definition
01 - 02h Reserved for historical uses
05 - 3Eh Reserved
3Fh Manufacturer default definition
40 - 7Fh Vendor specific