Fujitsu M2488 Product Manual page 241

M2488 PRODUCT GUIDE
Table 5-5. Error Recovery and Reporting Parameters Field Description (Continued)
BYTE BIT VALUE
2
2
2 3
2 5
3 0-7
8 0-6
8 7
April 1997
1 When the Post Error (PER) bit is set to one, this bit indicates that the target enables
reporting of CHECK CONDITION status for recovered errors, with the appropriate
sense key being returned. CHECK CONDITION status occurs during the data
transfer depending either on the DTE bit value or if an unrecoverable error
occurred. If multiple errors occur, the REQUEST SENSE data reports the block
address of either the last block on which recovered error occurred or of the first
unrecovered error. If this bit is 0, the DTE bit must also be 0.
0 When PER is set to zero, this bit indicates that the target does not create the
CHECK CONDITION status for errors recovered within the limits established by
the other error recovery flags. Recovery procedures exceeding the limits established
by the other error recovery flags are posted accordingly by the target. The transfer
of data may terminate prior to exhausting the transfer length depending on the error
and the state of the other error recovery flags.
The PER bit is reported as changeable on a MODE SENSE command, and the
default value is zero.
1 When the Enable Early Recovery (EER) bit is set to one, this bit indicates that the
target enables the use of the most expedient form of error recovery, such as error
correction, before applying retries. Seek or positioning retries and the recovery pro-
cedure retries of the message system are not affected by the value of this bit.
0 When EER is set to zero, this bit indicates that the target exhausts the defined retry
limit prior to enabling error correction.
The EER bit is reported as not changeable on a MODE SENSE command and the
default value is one.
1 When Transfer Block (TB) is set to one, this bit indicates that the failing data block
(recovered or unrecovered) is transferred to the initiator.
0 When TB is set to zero, this bit indicates that an unrecovered failing data block is
not transferred to the initiator. Recovered data blocks are always transferred, regard-
less of the values of the TB bit.
In both cases the block reported in the Request Sense data is the block in error, not
the preceding block.
The TB bit is reported as changeable on a MODE SENSE command, and the
default value is zero.
>0 A non-zero value in Read Retry Count field specifies the number of times that the
target attempts its recovery algorithm during a read operation before an unrecover-
able error is reported.
0 A value of zero in this field indicates that the target shall not use its recovery algo-
rithm during read operations.
The Read Retry Count field is reported as changeable, and the default value is 10h.
>0 A non-zero value in the Write Retry Count field specifies the number of times that
the target attempts its recovery algorithm during a write operation before an unre-
coverable error is reported.
0 A value of zero in this field indicates that the target shall not use its recovery algo-
rithm during write operations.
The Write Retry Count field is reported as changeable and the default value is 10h.
The meaning of this bit is dependent upon the setting of the WRTY bit in Mode
Page 00. With WRTY set to 0, this bit is defined as the MSB of the Write Retry
Count. Otherwise:
0 Report permanent error when count in bits 0-6 is exhausted.
Do not report error, continue writing next block. CAUTION: This setting may pro-
1
duce unreadable tapes.
CG00000-011503 REV. A
TAPE UNIT PARAMETERS
DESCRIPTION
5-5