Quantum DLT 4000 Manual descargar pdf (Pagina 237)

SCSI Commands

Quantum DLT 4000 Tape Drive 5-137

REQUEST SENSE Command (03h) (continued)

Table 5–66 REQUEST SENSE Data - Field Descriptions

Field Name Description

Valid When set to 1, this field indicates that the information bytes contain valid

information as defined in the ANSI SCSI-2 specification.

Error Code A value of 70h indicates a current error – the report is associated with the most

recently received command.

A value of 71h indicates a deferred error – the report is associated with a

previous command and not as a result of the current command.

No other values are returned in this field.

Segment

Number

This value of this byte is always 0.

Filemark This bit indicates that the current command has read a Filemark.

EOM End of Medium. This bit indicates that an End of Medium condition (End of

Partition or Beginning of Partition) exists. The warning is also given by setting

the Sense Key to NO SENSE and the Additional Sense Qualifier to End of Partition

or Beginning of Partition.

ILI Incorrect Length Indicator. This bit indicates that the requested logical block

length did not match the logical block length of the data on the tape medium.

Only READ or VERIFY may cause this bit to be set.

Sense Key In most cases, Additional Sense Code and/or Qualifier information is available.

The codes and qualifiers are covered in detail in Table 5-67.

Information

Bytes

These bytes contain the differences (residue) of the requested length minus the

actual length in bytes, blocks, or Filemarks, as determined by the command.

Negative values are indicated by two’s complement notation. The bytes are valid

for all READ, WRITE, SPACE, and VERIFY tape commands for which a CHECK

CONDITION status has been generated. The information bytes are 0 for MODE

SELECT / SENSE, INQUIRY, READ BLOCK LIMITS, and TEST UNIT READY.

Additional Sense

Length

This field specifies the number of additional sense bytes to follow. If the

Allocation Length of the Command Descriptor Block is too small to transfer all

of the Additional Sense bytes, the Additional Sense Length is not adjusted to

reflect the truncation.

1 2 ... 232 233 234 235 236 237 238 239 240 241 242 ... 299 300

Sin comentarios

Quantum DLT 4000 Manual Pagina 237