IBM IC35L036UWDY10 Hard Drive Specifications - Page 82

Log parameters, Header, Log Parameters

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8.7.1 Log Page parameters Each log page begins with a four-byte page header followed by zero or more variable-length log parameters. ! Page Header Page Code field identifies which log page is being transferred. The Page Length field specifies the length in bytes of the following log parameters. ! Log Parameters Each log parameter begins with a four-byte parameter header followed by one or more bytes of parameter value data. The Parameter Code field identifies which log parameter is being transferred for that log page. The Parameter Control field, the 3rd byte of each parameter header, contains several fields: • DU (Disable Update) bit is set to 0 which indicates that the drive updates the log parameter value to reflect events that should be noted by that parameter. • DS (Disable Save) bit is set to 1 to indicate the parameter is non-savable and is set to 0 to indicate that the parameter is savable. • TSD (Drive Save Disable) bit is set to zero which indicates that the drive provides a drive defined method for saving log parameters. • ETC (Enable Threshold Comparison) bit is set to 0 which indicates the drive does not perform comparisons between cumulative and any threshold values. • TMC (Threshold Met Criteria) field is not valid because this drive does not perform threshold comparisons. This field is set to 0. • LBIN (List Binary) bit is only valid if the LP is 1. If the LP bit is 1 and the LBIN bit is 0, the list parameter is a string of ASCII graphic code (20h - 7Eh). If the LP bit is 1 and the LBIN bit is 1, the list parameter is a list of binary information. • LP (List Parameter) bit is set to 0 for parameters that are data counters. The LP bit is set to 1 for parameters that are lists. Ultrastar 146Z10 hard disk drive specifications 66

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8.7.1 Log Page parameters
Each log page begins with a four-byte page header followed by zero or more variable-length log para-
meters.
!
Page Header
Page Code field identifies which log page is being transferred.
The Page Length field specifies the length in bytes of the following log parameters.
!
Log Parameters
Each log parameter begins with a four-byte parameter header followed by one or more bytes of para-
meter value data.
The Parameter Code field identifies which log parameter is being transferred for that log page.
The Parameter Control field, the 3rd byte of each parameter header, contains several fields:
•
DU (
Disable Update) bit is set to 0 which indicates that the drive updates the log parameter value
to reflect events that should be noted by that parameter.
•
DS
(Disable Save) bit is set to 1 to indicate the parameter is non-savable and is set to 0 to
indicate that the parameter is savable.
•
TSD
(Drive Save Disable) bit is set to zero which indicates that the drive provides a drive defined
method for saving log parameters.
•
ETC
(Enable Threshold Comparison) bit is set to 0 which indicates the drive does not perform
comparisons between cumulative and any threshold values.
•
TMC
(Threshold Met Criteria) field is not valid because this drive does not perform threshold
comparisons.
This field is set to 0.
•
LBIN
(List Binary) bit is only valid if the LP is 1. If the LP bit is 1 and the LBIN bit is 0, the list para-
meter is a string of ASCII graphic code (20h - 7Eh).
If the LP bit is 1 and the LBIN bit is 1, the list
parameter is a list of binary information.
•
LP
(List Parameter) bit is set to 0 for parameters that are data counters. The LP bit is set to 1 for
parameters that are lists.
Ultrastar 146Z10 hard disk drive specifications
66