User's Guide

Commands: Mode Select (15h) Page 85
Tape Alert Mode Page 1C
Bits
Byte 7 6 5 4 3 2 1 0
0 0 0 Page Code (1Ch)
1 Page Length (0Ah)
2 Perf Reserved DExcpt Test Reserved LogErr
3 Reserved MRIE
4 Interval Timer (MSB)
5 Interval Timer
6 Interval Timer
7 Interval Timer (LSB)
8 Report Count/Test Flag Number (MSB)
9 Report Count/Test Flag Number
10 Report Count/Test Flag Number
11 Report Count/Test Flag Number (LSB)
DExcpt (Default set to 1):
When this bit is set to zero the reporting method indicated by the MRIE field is used.
When this bit is set to one this indicates that the drive disables all information
exception operations, ignoring the MRIE field (In this mode the software must poll
the TapeAlert Log page). Thus to enable “check condition” mode set the bit to zero.
LogErr (Default set to 0):
When this bit is set to zero, this indicates that the logging of informational exception
is vendor specific, this setting is reserved in Scorpion 40. When this bit is set to
one, Scorpion 40 logs informational exception conditions.
Perf (Default set to 0):
When this bit is set to zero, this indicates that informational exception operations
that can cause delays are acceptable. When this bit is set to one, the drive shall not
cause delays while doing informational exception operations. In Scorpion 40 there is
no significant performance impact from Tape Alert operations.
Test (Default set to 0):
When this bit is set to zero, this indicates that the drive shall not generate any
false/test informational exception conditions.
When this bit is set to one and Test Flag Number is set to zero, the drive will
generate a false informational exception condition based on the MRIE field (the
Interval Timer field is ignored and the Report Count field is used as the Test Flag
Number). When a false information exception condition is posted, the TapeAlert
flags in the Log page are not modified. However, real informational exception
conditions have priority over false informational exception conditions.
The Test bit will be automatically cleared when the false information exception
condition is posted on the first command (excluding Inquiry and Request Sense) that
is received with no real information exception condition pending. The false
informational exception condition will then be reported in the method specified by
the MRIE value, except with the additional sense code set to 0x5DFF. If both the