User's Guide

Chapter 3 Emulated DLT7000 SCSI Commands
Log Select (4Ch)
152 Quantum DX-Series Software Interface Guide
Log Detection
Summary in LOG
SELECT
Command
Descriptor Block
3
The following conditions constitute errors that are detected by the drive
in relation to the CDB. The request sense data is set to ILLEGAL
REQUEST, INVALID FIELD IN CDB.
The conditions that constitute errors are:
• PCR bit is set to 1 and parameter list is not set to 0.
• SP bit is set to 1
• A parameter list length that would cause a parameter within a valid
page to be truncated or otherwise incompletely initialized.
Operation of LOG
SELECT
3
The LOG SELECT command allows the initiator to modify and initialize
parameters within the logs supported by the tape drive.
There are two ways to initialize the log parameters.
1 Set the PCR bit in the LOG SELECT CDB; this clears all parameters.
2 Specify the log page and parameter values as the log parameters to
clear individual pages. The following pages can be cleared using this
method:
Parameter List
Length
This field specifies the length, in bytes, of the
LOG SELECT parameter list to be transferred
from the initiator to the target during the DATA
OUT phase. A parameter list length of 0 indicates
that no data is to be transferred. This condition is
not considered an error.
Partition Not applicable (see Change Partition field
above).
Page Code Page Description
02h Writer Error Count Page
03h Read Error Count Page
32h Compression Ratio Page
Field Name Description