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SCSI Commands

5-38 Quantum DLT 4000 Tape Drive

LOG SELECT Command (4Ch) (continued)

Table 5–18 LOG SELECT Log Parameters Field Descriptions (continued)

Field Name Description

TMC

(cont.)

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.

LP List Parameter. This bit should always be set to 0 to indicate parameter codes are

treated as data counters.

Parameter

Length

This field specifies the number of bytes of the parameter value.

Parameter

Value

This field indicates the actual value of this log parameter.

5.7.4 Error Detection Summary in LOG SELECT Pages

The host issues a LOG SENSE command to initialize host-resident software

that allows determination of:

• The log pages used by the drive

• The parameter codes and length of each parameter

The following conditions constitute errors in the parameter block that cause the

drive to return CHECK CONDITION with sense data set to ILLEGAL

REQUEST and additional send code INVALID FIELD IN PARAMETER LIST:

• A page header is received with unsupported page codes

• An incorrect log page length is specified in the page header

• An illegal parameter code is contained in a valid page code

• Parameter codes for a supported page are not sent in ascending order

• The LP bit is set to 1 in the parameter control byte

• The DS bit is set to 0 in the parameter control byte

• The TSD bit is set to 0 in the parameter control byte

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Quantum DLT 4000 Handbuch Seite 138