Fujitsu M2488, Руководство по эксплуатации продукта

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TAPE UNIT PARAMETERS M2488 PRODUCT GUIDE
5-2 CG00000-011503 REV. A April 1997
5-2.2 Vendor Unique Parameter
Table 5-2. Page 00 - Vendor Unique Parameter
BITS MODE
SENSE
DEFAULT
VALUES
BYTES 7 6 5 4 3 2 1 0
0 PS * Reserved Page Code 80h
1 Additional Page Length 0Eh
2
Reserved WRTY Reserved PAEB Reserved 00h
3 Reserved FRU Reserved
00h
4 ADTT
FEh
5-15 Reserved 00h
* The PS bit must be set to 0 on a MODE SELECT command.
Table 5-3. Page 00 -Vendor Unique Parameter Field Description
BYTE BIT VALUE DESCRIPTION
2 6 1
0
When the WRTY bit is set to one, the following feature will be activated:
* if bit 7 of the Write Retry Count field in Mode Page 01h is set to zero, permanent write
errors are to be reported after the retry count in bits 6-0 of the Write Retry Count field have
been exhausted.
* if bit 7 of the Write Retry Count field in Mode Page 01h is set to one, write errors are not
reported, and writing is continued on the next block unless the tape position is lost while
attempting the write operations. CAUTION: This setting may produce unreadable tapes.
When WRTY is set to zero, bits 7-0 of the Write Retry Count field all represent the retry
count setting and permanent write errors will always be reported.
The WRTY bit is reported as changeable on a MODE SENSE command, and the default
value is zero.
2 4 1
0
When the Position After Error Block (PAEB) bit is set to one, and there is a permanent read
error on tape, the read head is positioned on the opposite side of the error block from the
direction being read (i.e. EOT side for a read forward operation or BOT side for a read
reverse operation). When the read error occurs during a Read (forward) operation, a Read
Position command gives the BID of the block following the block in error.When the read
error occurs during a Read Reverse operation, a Read Position command gives the BID of
the actual block in error.
When PAEB is set to zero, everything remains the same except for the Read Position data,
which would give the BID of the block to position to in order to retry the same read opera-
tion on the bad block. This allows alternate device retry by the host.The host system
requests the cartridge be moved to another device, does a Locate to the block indicated in
the Read Position data, followed by a read operation in the same direction as when the read
data check originally occurred (Read or Read Reverse).
The PAEB bit is reported as changeable on a MODE SENSE command and the default
value is zero.