Seagate MEDALIST 1080SL Product Manual page 53

Medalist 1080sl SCSI Product Manual, August 1995
changeable. The changeability values for each bit of each mode page
are listed in Appendix C with the default values.
Default values copy. This copy contains the parameter values the
drive used as its current values when it was manufactured. The drive
defaults to these values after a reset condition, unless valid saved
values are available. The default values are listed in Appendix C.
Saved values copy. The saved values are the values the drive stores.
If the parameter is changeable, these values can be set using a Mode
Select command. If the parameter is not changeable, the default
values are always used.
The drive has one set of mode parameters for all of the initiators on the
SCSI bus. If the initiator that issued the Mode Select command changes
a parameter that applies to another initiator, the drive generates a sense
key of unit attention with an additional sense of mode parameters
changed (2A
/01) for all the other initiators. The sense keys and addi-
H
tional sense codes are discussed in Appendix B.
Before sending the Mode Select command, the initiator should send a
Mode Sense command requesting that the drive return the changeable
values for all pages. The initiator uses this information to determine which
pages are supported, the proper length for those pages and which
parameters in those pages can be changed for that logical unit. Also,
before sending each Mode Select command, the initiator should send a
Mode Sense command to request the current values.
When the drive receives the Mode Select command, it updates the
saveable parameters with the current values included in the Mode Select
command. After the drive saves the parameters, it reports a good status.
The drive verifies all Mode Select data.
If the drive detects invalid parameter data during the Mode Select
command, it sends a sense key of illegal request with an additional sense
code of invalid field in parameter list , and no parameters are changed.
Bytes
7 6
0 0 0
1 LUN
2 0 0
3 0 0
4
5 0 0
Bits
5 4 3 2
0 1 0 1
PF = 1 0 0
0 0 0 0
0 0 0 0
Parameter list length
0 0 0 0
43
1 0
0 1
0 SP
0 0
0 0
0 0