Information Exceptions mode page
The Information Exceptions Mode page is used to control exception reporting through the “TapeAlert log page” on page 65:
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| 2 |
| Perf (0) |
| Reserved (0) |
| DExcpt |
| Test | Rsvd (0) | LogErr (0) |
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| MRIE (3h) |
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| Interval Timer (0) |
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| 7 |
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| 8 |
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| Report Count/Test Flag Number |
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| 11 |
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| Perf |
| 0 Informational exception operations that cause delays are acceptable. |
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| DExcpt |
| Disable Exception Control. It must be zero when the Test Flag Number is zero. When |
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| the Test Flag Number contains a valid |
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| 0 Information exception operations are enabled. The reporting of information |
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| exception conditions is determined from the MRIE field. |
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| 1 A DExcpt bit of one indicates the target will disable all information exception |
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| operations. The method of reporting informational exceptions field is ignored |
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| when DExcpt is set to one. The Test bit must not be set at the same time. |
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| Test |
| 0 If the Test flag is clear the next command will be processed normally. |
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| 1 A test bit of one will generate false informational exception conditions. As a |
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| result, the next SCSI command after the Mode Select will return CHECK |
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| CONDITION with a sense key of RECOVERED ERROR and additional sense of |
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| 5DFFh (failure prediction threshold exceeded - false). The DExcpt bit must not be |
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| set at the same time. |
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| The Test bit will never be read as 1 when performing a Mode Sense command. This |
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| is not an indication that the drive is in test mode. |
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| For example, using the Test bit and Test Flag Number, it may be possible to set a flag |
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| with the DExcpt bit set to 1. When the DExcpt bit is next set, the drive will report |
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| CHECK CONDITION with a sense key of RECOVERED ERROR and additional sense |
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| of 5DFFh (failure prediction threshold exceeded - false). In order to set the DExcpt bit |
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| again, note that the Test bit must still be set during the Mode Select command. |
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| LogErr |
| 0 Log Errors bit. This bit must be zero, indicating that the logging of informational |
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| exception conditions within the drive is |
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MODE SELECT 15h/55h 91