User's Guide

Chapter 2 Emulated Medium Changer SCSI Commands
Log Sense (4Dh)
Quantum DX-Series Software Interface Guide 27
• Logical Unit Number
Logical Unit Number must be set to 0. Field indicates the logical unit
to which the command is sent.
• PPC
Parameter Pointer Control field is not supported and must be set to
0.
•SP
Save Parameters field is not supported and must be set to 0.
•PC
Page Control field defines type of parameter values to be selected.
Only cumulative values are supported, therefore this field must be
set to 1.
• Page Codes
Currently, there are 3 supported page codes:
• 00h — Supported Log Page (see table 21).
• 30h — Medium Changer Statistic Page (see table 22).
• 3Fh — Return all supported pages. This is a composite of all
pages, returned sequentially. Order is Supported Log Page
followed by Medium Changer Statistic Page.
• Parameter Pointer
Field allows host to request parameter data beginning from a specific
parameter code to the maximum allocation length or the maximum
parameter code supported by the target, whichever is less. For
parameter codes, see
table 24.
• Allocation Length
Field specifies how much memory host has set aside to store log
sense information returned by the DX-Series system.
• Supported Log Page
Page returns the list of log pages supported (see table 21).