Information Exceptions mode page

The Information Exceptions Mode page is used to control exception reporting through the “TapeAlert log page” on page 65:

 

 

 

7

6

 

5

4

3

 

2

1

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

PS (0)

Rsvd (0)

 

 

Page Code {1Ch}

 

 

 

Commands

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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. The Test bit must not be set at the same time.

 

 

 

 

 

 

 

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 DExcpt bit must not be

 

 

 

 

 

 

set at the same time.

 

 

 

 

 

 

 

 

 

 

 

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.

 

 

 

 

 

 

 

LogErr

 

0 Log Errors bit. This bit must be zero, indicating that the logging of informational

 

 

 

 

 

 

exception conditions within the drive is vendor-specific.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MODE SELECT 15h/55h 91