Quantum 1200 Series DAT Autochanger Guía de usuario descargar pdf (Pagina 233)

SDLT 600 SCSI Interface Guide Chapter 4: SCSI Commands

81-81200-02 REV A01 January 2005 4-191

LOCU Logical Object Count Unknown. When set to 1, indicates that the

value contained in the Number of Logical Objects in Object Buffer

field does not accurately represent the actual number of logical objects

in the object buffer. When set to 0, indicates that the value contained in

the Number of Logical Objects in Object Buffer field is accurate.

BYCU Byte Count Unknown. When set to 1, indicates that the value

contained in the Number of Bytes in Object Buffer field does not

accurately represent the actual number of bytes in the object buffer.

When set to 0, indicates that the value contained in the Number of

Bytes in Object Buffer field is accurate.

LOLU Logical Object Location Unknown. When set to 1, indicates that the

values contained in the Partition Number, First Logical Object Loca-

tion, or Last Logical Object Location fields are not known or accurate

reporting is not currently available. When set to 0, indicates that the

values these fields contain are accurate.

PERR Position Error. When set to 1, indicates that the drive is unable to

report the correct position as a result of an overflow in any of the

returned positional data fields. When set to 0, indicates that there were

no overflow conditions in any of the returned positional data fields.

Partition Number The partition number for the current logical position.

First Logical Object

Location

The block address associated with the current logical position; the next

block to be transferred between the target and initiator if a READ or

WRITE command is issued.

Last Logical Object

Location

The block address associated with the current physical position; the

next block to be transferred to tape medium from the drive’s buffer. If

the buffer is empty, or has only a partial block, the same value as First

Block Location is reported. The first block or filemark written onto the

tape medium is at address 0.

Number of Logical

Objects in Object

Buffer

The number of data blocks in the drive’s buffer that have not been

written to the tape medium.

Number of Bytes in

Object Buffer

The number of data bytes in the drive’s buffer that have not been

written to the tape medium.

Table 4-111. READ POSITION (Short Form) Data — Field Descriptions (Continued)

Field Name Description

1 2 ... 228 229 230 231 232 233 234 235 236 237 238 ... 293 294

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