Fujitsu M2488, Руководство по эксплуатации продукта

Страница: 117 / 528

M2488 PRODUCT GUIDE TAPE UNIT SCSI COMMANDS
April 1997 CG00000-011503 REV. A 4-35
In addition to the ANSI defined conditions for clearing of log data, log data will be cleared by the
following:
1. A LOG SENSE command (clears counters only for the page requested). The specified page is
returned to its default value even if the Allocation Length field was zero. NOTE: This condition for
clearing the log counters is dependent on the state of bit 7 (0x80) in feature setting FT5 as
described in the M2488 User’s Guide.
2. When a cartridge is unloaded via the LOAD/UNLOAD command, or MOVE MEDIUM com-
mand.
3. MTU not ready to ready transition (e.g. cartridge load operation or pressing the op-panel Reset
key followed by the Start key while a cartridge is in the MTU).
Log counters are not allowed to overflow. When a log counter reaches its maximum value, incre-
menting of all counters within that log page cease until they are cleared by one of the actions listed
above. If a log counter has reached its maximum value and the RLEC bit in the MTU mode page
0Ah is one, the next successful command issued to the device associated with that counter will
receive CHECK CONDITION status with RECOVERED ERROR set in the sense key. The ASC/
ASCQ field will be returned as 5B02h, LOG COUNTERS AT MAXIMUM.
To disable the reporting of log overflow conditions, set the RLEC bit to zero in the Mode Select
page 0Ah (Common device types control parameters).
4-3.10.3 LOG SENSE Parameters
The LOG SENSE command returns data in a page format. Each log page begins with a four-byte
page header followed by zero or more variable length log parameters defined for that page. The log
page format and log parameter format are defined below:
Table 4-32. Log Page Format
BITS
BYTES 7 6 5 4 3 2 1 0
0 Reserved Page Code
1 Reserved
2-3 Page Length (n-3)
4 TO X+3 First Log Parameter (Length x)
. . . More Log Parameters
N-Y TO N Last Log Parameter (Length y)