Chapter 4 SCSI Commands
MODE SELECT (6) / (10) Command (15h / 55h)
DLT-S4 Interface Reference Guide
140
Table 84 TapeAlert
MODE
SELECT
Page — Field
Descriptions
Field
Description
PS
Parameters Savable. For
MODE SELECT
, must be set to 0.
SPF
SubPage Format. Always set to 0. Indicates that this page uses the page_0 page format.
Page Code
Identifies the type of
MODE SELECT
page being transferred. A value of 1Ch identifies
this as the TapeAlert Page.
Page Length
Indicates the number of bytes in the page, excluding bytes 0 and 1. The length is
returned in
MODE SENSE
commands and must subsequently be set to the same value
when performing
MODE SELECT
.
Perf
Performance. Performance Impacting Exceptions are acceptable. The drive ignores this
bit.
EBF
Enable Background Function. Must be set to 0.
EWASC
Enable Warning. Must be set to 0.
DExcpt
Disable Information Exception Operations. When set to 0, the reporting method
specified by the contents of the MRIE field is selected. When set to 1, all information
exception conditions are disabled regardless of the contents of the MRIE field. When in
this mode, the software polls the TapeAlert Log page. To enable
CHECK CONDITION
mode, set DExcpt to 0. Default setting is 1.
Test
Generates false TapeAlert conditions to test the response to failure conditions (see the
Report Count / Test Flag Number description for more information). If both Test and
DExcpt are set to 1, the drive returns
CHECK
CONDITION
status, Sense Key
ILLEGAL
REQUEST
, and Additional Sense Code set to
INVALID FIELD IN PARAMETER LIST
.
LogErr
Error Log. Must be set to 0.