Information exceptions mode page – HP C737990900 User Manual
Page 89
Commands 89
Co
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Information Exceptions Mode Page
The Information Exceptions Mode page is used to control exception reporting
through the
“TapeAlert Log Page” on page 67
:
7
6
5
4
3
2
1
0
0
PS (0)
Rsvd (0)
Page Code {1Ch}
1
Page Length {0Ah)
2
Perf (0)
Reserved (0)
DExcpt
Test
Rsvd (0) LogErr (0)
3
Reserved (0)
MRIE (3h)
4
(MSB)
Interval Timer (0)
7
(LSB)
8
(MSB)
Report Count/Test Flag Number
11
(LSB)
Perf
0 Informational exception operations that cause delays are acceptable.
DExcpt
Disable Exception Control. It must be zero when the Test Flag Number is zero. When the Test
Flag Number contains a valid non-zero value, the DExcpt flag can be 0 or 1.
0 Information exception operations are enabled. The reporting of information exception
conditions is determined from the MRIE field.
1 A DExcpt bit of one indicates the target will disable all information exception operations.
The method of reporting informational exceptions field is ignored when DExcpt is set to
one.
Test
0 If the Test flag is clear the next command will be processed normally.
1 A test bit of one will generate false informational exception conditions. As a result, the
next SCSI command after the Mode Select will return
CHECK CONDITION
with a sense
key of
RECOVERED ERROR
and additional sense of 5DFFh (failure prediction threshold
exceeded - false).
The Test bit will never be read as 1 when performing a Mode Sense command. This is not an
indication that the drive is in test mode.
For example, using the Test bit and Test Flag Number, it may be possible to set a flag with the
DExcpt bit set to 1. When the DExcpt bit is next set, the drive will report
CHECK CONDITION
with a sense key of
RECOVERED ERROR
and additional sense of 5DFFh (failure prediction
threshold exceeded - false). In order to set the DExcpt bit again, note that the Test bit must still
be set during the Mode Select command.