SCSI Commands

LOG SENSE Command (4Dh) (continued)

Table 5–19 LOG SENSE Command Descriptor Block - Field Descriptions

Field Name

Description

 

 

PPC

Parameter Pointer Control. This bit must be set to 0. 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 return the number of

 

bytes specified in the Allocation Length field (Bytes 7 - 8) in ascending order of

 

parameter codes from the specified log page.

 

Note that the current implementation of the READ/WRITE COMPRESSION page

 

does not support a PPC other than 0.

 

If PPC bit is set, then the target terminates the command with CHECK CONDITION

 

status, sense key set to ILLEGAL REQUEST, and additional sense code set to

 

INVALID FIELD IN CDB.

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 zero.

 

By default, Current Threshold Values = Default Threshold Values.

 

Note that all types of parameter values are changeable via LOG SELECT.

 

 

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Quantum DLT 7000 Tape System

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Quantum Instruments DLT 7000 manual LOG Sense Command 4Dh, LOG Sense Command Descriptor Block Field Descriptions, Ppc

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