User's Guide
Table Of Contents
- Preface
- Theory of Operation
- Media Changer Commands
- Overview of Command and Status Processing
- Media Changer Command Descriptions
- Initialize Element Status Command (07h)
- Inquiry Command (12h)
- Load Unload Command (1Bh)
- Log Sense Command (4Dh)
- Mode Select (6) / (10) Command (15h / 55h)
- Mode Sense (6) / (10) Command (1Ah/ 5Ah)
- Move Medium Command (A5h)
- Persistent Reserve In Command (5Eh)
- Persistent Reserve Out Command (5Fh)
- Position to Element Command (2Bh)
- Prevent/Allow Medium Removal (1Eh)
- Read Buffer Command (3Ch)
- Read Element Status Command (B8h)
- Release Element (10) Command (57h)
- Release Unit (6) Command (17h)
- Report Device Identifier Command (A3h)
- Report LUNS Command (A0h)
- Request Sense Command (03h)
- Reserve Element (10) Command (56h)
- Reserve Element (6) Command (16h)
- Send Diagnostic Command (1Dh)
- Set Device Identifier Command (A4h)
- Test Unit Ready Command (00h)
- Write Buffer Command (3Bh)
- Index
Chapter 2 Media Changer Commands
Log Sense Command (4Dh)
Quantum SuperLoader 3 Software Interface Guide 24
Table 8 Log Sense Command
Descriptor Block
Field Name Description
PPC
Parameter Pointer Control. A PPC of 0 indicates that the parameter data
requested from the device starts with the parameter code specified in the
Parameter Pointer field (Bytes 5 - 6) and returns the number of bytes specified
in the
Allocation Length field (Bytes 7 - 8) in ascending order of parameter
codes from the specified log page. Request for changed parameters is not
supported. This field must be 0.
SP
Save Parameters. Not supported, must be set to 0. If for some reason the Save
Parameters
bit is set, the command terminates with a CHECK CONDITION status
with a sense key of
ILLEGAL REQUEST and an ASC of INVALID FIELD IN CDB.
PC
Page Control. This field defines the type of parameter values to be returned:
PC Type of Parameter Values
00b Threshold Values
01b Cumulative Values
10b Default Threshold Values
11b Default Cumulative Values
The
Default Threshold Values are the maximum values that each parameter can
attain.
The
Current Cumulative Values are the values computed since the last reset of
the device (either via power-cycle,
BUS DEVICE RESET, or SCSI RESET.)
The
Default Cumulative Values are the values to which each parameter is
initialized at a reset condition. Default values are 0.
By default,
Current Threshold Values = Default Threshold Values.
Page Code The
Page Code field identifies which log page is being requested by the
initiator. If the page is not supported, then the command terminates with a
CHECK CONDITION status, sense key set to ILLEGAL REQUEST, and additional
sense code of
INVALID FIELD IN CDB. Supported pages are:
Page Code Page Definition
00h Supported Pages Log Page (
00h)