Fujitsu 80, Scsi Logical Interface Specifications

Page: 43 / 310

1.7 Command Processing Exceptions
C141-C010 1-25
Also, if initialization of the disk media (formatting) has not been completed normally, it will be
impossible to access data on the disk media.
Processing of and response to commands received by the IDD when it is in the not ready state or in the
initialization incomplete state are described below. Furthermore, starting control of the spindle motor
when the power is switched on can be selected from either or two methods, through the setting terminal
(motor start mode) on the IDD, with rotation started at the same time as when the power is switched on or
through the START/STOP UNIT command.
(1)
General response in not ready state
The IDD reports a CHECK CONDITION status for a command, except in cases where the command is
one of the commands in item (2). The sense data generated at this time depends on the state of the IDD,
as shown in Table 1.3.
Table 1.3 Sense data in not ready state
IDD State Sense Key Additional Sense Code
Spindle motor not rotating
at normal speed. NOT READY
[=2]
Logical unit not ready
[=04-01]
Reading system
information have not
completed. NOT READY
[=2]
Logical unit not ready
[=04-01]
Reading system
information failed. HARDWARE ERROR
[=4]
Logical unit failed self-configuration
[=4C-nn]
(2) Commands that can be executed even in the not ready state
If the IDD receives any of the following commands, it executes those commands even if it is in the Not
Ready state.
•
START/STOP UNIT command
•
RESERVE/RESERVE EXTENDED command
•
RELEASE/RELEASE EXTENDED command
•
WRITE BUFFER command
•
READ BUFFER command
•
INQUIRY command
•
REPORT LUNS command
•
REQUEST SENSE command: The REQUEST SENSE command is executed normally. If the IDD is
in the sense data hold state, the sense data being held at that time are transferred to the INIT. If not,
sense data appropriate to the IDD’s state at that time are transferred to the INIT (See Table 1.3).