4-3.33.2 Write Filemarks Check Condition Status; Table 4-133. Write Filemark Command Operations - Fujitsu M2488 Product Manual

M2488 PRODUCT GUIDE

Table 4-133. WRITE FILEMARK Command Operations

BUFFER IMMED
MODE * BIT
0h (non-buffered 0
mode)
1
1h, 2h (buffered 0
modes
1
* This is the Buffer Mode reported by the MODE SENSE command. It is contained in the device specific parameter
byte of the mode parameter header
4-3.33.2 WRITE FILEMARKS CHECK CONDITION Status
If the Valid bit is set to 1 of Sense data for a CHECK CONDITION presented for a WRITE
FILEMARKS command then the Information field in the Sense data is set as follows:
BUFFER
MODE
non-buffered
buffered
buffered
When the WRITE FILEMARKS command is received, the tape unit tries to determine if there is a
reason why all of the requested filemarks can't be written. The tape unit will check if the block IDs
for the requested filemarks are within the tape format limits. The tape unit may also check if the
requested number of filemarks will fit upon the remaining length of unwritten tape.
If the tape unit determines that the requested filemarks cannot all be written then it will not buffer
any of the filemarks and will present CHECK CONDITION status. The error sense data will indi-
cate VOLUME OVERFLOW, the Valid bit will be set to 1 and the Information field will be set as
described above. Note that if the tape unit does not present this type of error, it does not necessar-
ily mean that the requested filemarks will all fit on tape; the tape unit can only roughly estimate
how many filemarks will fit upon the remaining length of unwritten tape.
April 1997
Write requested filemarks to tape
Illegal (ILLEGAL REQUEST) sense data will be presented
Buffer new filemarks for write and then write all previously buffered data and
filemarks to tape.
Buffer new filemarks for write
BLOCK
INFORMATION FIELD
MODE
Contains the number of new filemarks that were not
written.
fixed Contains the number of buffered blocks and buffered
filemarks and new filemarks that were not written.
variable Contains the number of buffered bytes and buffered
filemarks and new filemarks that were not written.
CG00000-011503 REV. A
TAPE UNIT SCSI COMMANDS
OPERATION
4-151