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8-6

SCSI REFERENCE 1014826

CHAPTER 8—LOG SENSE (4Dh)

8.3.1 LOG PARAMETER FORMAT

Each log parameter begins with a four-byte header followed by one or more

bytes of parameter value data.

Parameter Code – Bytes 00 and 01

The Parameter Code field identifies which log parameter is being transferred

for that log page. The valid values for this field depend on the type of log page

the library is returning, as described later in this chapter.

Parameter Control (DU, DS, TSD, ETC, TMC, LP) – Byte 02

The Parameter Control field consists of the following bits:

DU – Disable Update This bit indicates that the library updates the log

parameter value to reflect all events that should be recorded by that

parameter. This bit is always 0.

DS – Disable Save This bit indicates that the library does not support saving

for that log parameter. This bit is always 1.

TSD - Target Save Disable This bit indicates that the library provides a

self-defined method for saving log parameters. This bit is always 0.

ETC – Enable Threshold Comparison This bit indicates a comparison to the

threshold value is not performed whenever the cumulative value is updated.

This bit is always 0.

TMC – Threshold Met Criteria This field defines the basis for comparison of

the cumulative and threshold values. This field is always 0.

LP – List Parameter The List Parameter bit indicates the format of the log

parameter:

Bit

Byte

7 6 5 4 3 2 1 0

00 (MSB)

Parameter Code

(LSB)

02 DU DS TSD ETC TMC RSVD LP

03 Parameter Length

04 (MSB)

Parameter Value

(LSB)

...

0 The parameter is a data counter

1 The parameter is a list parameter

1 2 ... 77 78 79 80 81 82 83 84 85 86 87 ... 263 264

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Quantum LTO 2U Betriebsanleitung Seite 82