Fujitsu MAN3735 Manuale Utente
C141-E124-01EN
5 - 15
x Since the command stack feature exists (see Section 1.4), even if the IDD accepts a command
normally, if a command issued by another INIT is being executed, or if there are other
commands in the stack, execution of the command is caused to wait until all the other
commands have been processed. The execution wait time is dependent upon the type of
command issued by the other INITs and the contents of its specifications.
commands in the stack, execution of the command is caused to wait until all the other
commands have been processed. The execution wait time is dependent upon the type of
command issued by the other INITs and the contents of its specifications.
x If the IDD has executed error recovery processing (retried) for an error that occurred on the
SCSI bus or in the disk drive, command completion time will be longer than normal.
(4)
BUS FREE error
This error occurs in the case that the SCSI bus enters the BUS FREE phase at a time when the
INIT is not expecting it, during execution of a command on the SCSI bus. Even in cases where a
RESET condition is generated by another SCSI device on the bus, the same state occurs, but the
occurrence of an unexpected RESET condition should be processed as an abnormal state of the
system.
INIT is not expecting it, during execution of a command on the SCSI bus. Even in cases where a
RESET condition is generated by another SCSI device on the bus, the same state occurs, but the
occurrence of an unexpected RESET condition should be processed as an abnormal state of the
system.
The cause of this error is the occurrence of an unrecoverable error on the SCSI bus, the occurrence
of a serious protocol error, etc. For details concerning the causes of errors, see Chapter 3, "SCSI
Bus Error Recovery Processing" in Chapter 3 of the "SCSI Physical Specifications." When this
error is detected, the INIT should issue the REQUEST SENSE command and gather sense data
then judge the error recovery method according to the contents of the sense data (see Section
4.2.2).
of a serious protocol error, etc. For details concerning the causes of errors, see Chapter 3, "SCSI
Bus Error Recovery Processing" in Chapter 3 of the "SCSI Physical Specifications." When this
error is detected, the INIT should issue the REQUEST SENSE command and gather sense data
then judge the error recovery method according to the contents of the sense data (see Section
4.2.2).
5.2.2
Sense data analysis and error recovery methods
The INIT can judge the procedure for error recovery by analyzing the contents of the sense data
fetched by the REQUEST SENSE command. Table 5.3 the classifications of error information
displayed in the sense data are shown and in Table 5.4, the procedures for error recovery
recommended for the INIT to execute are shown. The error recovery procedure which can be
executed by the INIT will differ depending on the system's condition, so the optimum processing
procedure should be selected for the user system with reference to the following descriptions.
fetched by the REQUEST SENSE command. Table 5.3 the classifications of error information
displayed in the sense data are shown and in Table 5.4, the procedures for error recovery
recommended for the INIT to execute are shown. The error recovery procedure which can be
executed by the INIT will differ depending on the system's condition, so the optimum processing
procedure should be selected for the user system with reference to the following descriptions.