Fujitsu M2488 manual Space Check Condition Status, Filemark Parameter, End-of-Data Parameter

TAPE UNIT SCSI COMMANDS M2488 PRODUCT GUIDE

Table 4-126. Code Field Bits (Continued)

CODE FIELD

TYPE

DESCRIPTION

100b-111b

Invalid

These codes are not used by the unit.

4-3.29.2 SPACE CHECK CONDITION Status

If the Valid bit is set to 1 for Sense data for a CHECK CONDITION for a SPACE command, then the Information field in the Sense data contains a count of the remainder of blocks or filemarks not spaced over. If the spacing was in the reverse direction then the Information field value will be the negative of this remainder. The Information field in this case is a 32 bit signed number, 2’s comple- ment. In the case of a SPACE command by blocks stopped because a filemark was encountered, the filemark is not counted as a block that was spaced over. The Information field is not valid (the Valid bit is 0) for Sense data for a CHECK CONDITION when spacing to sequential filemarks.

Filemark Parameter:

If a filemark is encountered when spacing by blocks, the operation will stop. For forward spac- ing the final position will be the End-of-Tape side of the filemark. For backward spacing the final position will be the Beginning-of-Tape side of the filemark. CHECK CONDITION status will be reported for the Space command. Sense data will indicate NO SENSE; the Filemark bit will be 1; the Valid bit will be 1 and the Information field will be set as stated above.

End-of-Data Parameter:

If End-of-Data is encountered when spacing forward by blocks or filemarks (not to sequential filemarks), the operation will stop and the tape-unit remains positioned at End-of-Data. CHECK CONDITION status will be reported for the Space command. Sense data will indicate BLANK CHECK; the Valid bit will be 1 and the Information field will be set as stated above.

If End-of-Data is encountered when spacing forward to sequential filemarks, the operation will stop and the tape-unit remains positioned at End-of-Data. CHECK CONDITION status will be reported for the Space command. Sense data will indicate BLANK CHECK; the Valid bit will be 0.

End-of-Tape Parameter:

If End-of-Tape is encountered when spacing forward, the operation will stop and the tape-unit remains positioned at End-of-Tape. CHECK CONDITION status will be reported for the Space command. Sense data will indicate MEDIUM ERROR; the EOM bit will be 1; the Valid bit will be 1 and the Information field will be set as stated above.

Beginning-of-Tape Parameter:

If Beginning-of-Tape is encountered when spacing backward by blocks or filemarks (not to sequential filemarks), the operation will stop and the tape-unit remains positioned at Beginning- of-Tape. CHECK CONDITION status will be reported for the Space command. Sense data will indicate NO SENSE; the EOM bit will be 1; the Valid bit will be 1 and the Information field will be set as stated above.

If Beginning-of-Tape is encountered when spacing backward to sequential filemarks, the opera- tion will stop and the tape-unit remains positioned at Beginning-of-Tape. CHECK CONDI- TION status will be reported for the Space command. Sense data will indicate NO SENSE; the EOM bit will be 1; the Valid bit will be 0.

The Report Early-Warning (REW) bit in the Device Configuration Page is not supported by this tape unit. No Early-Warning indication will occur when spacing.

4-136 CG00000-011503 REV. A April 1997