Append Error; Phase Sequencing - Tandberg Data SLR7-140 PROGRAMMER Manual

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Tandberg Data
32.5.7.

Append Error

When the WRITE FILEMARKS command is executed after a
READ, LOCATE, SPACE or VERIFY command, or after a WRITE
FILEMARKS command where the data in the drive internal
buffer has been flushed to the tape, the Drive must seek
the last block on the tape before the write operation
starts. In all these situations an End Of Data marker
will identify where
located on the tape. If this seek operation fails, the
Drive will terminate the WRITE FILEMARKS command with a
CHECK CONDITION status. The Error Code will be set to
W
RITE APPEND POSITION ERROR
to one.
The Information Bytes in the sense data list will be set
to the difference
tapemarks and the actual number of tapemarks transferred
to the Drive's data buffer.
The EOD marker
consecutive read operations to terminate with E
D . The Append Error condition has priority over
ETECTED
the Logical Early Warning error condition.
Additional WRITE FILEMARKS commands issued after a non-
recoverable write error has occurred, will be terminated
immediately with a CHECK CONDITION (no data will be
transferred). The append error condition will persist
until a position type command has been executed (ERASE,
LOAD/UNLOAD or REWIND).

32.6. Phase Sequencing

In this section the possible SCSI-bus phase sequences
during execution of the command are described. Section
3.2 has more details about the generic phases in the
brackets.
:= <initiator-part> <message-out> <command> <disconnect> <reconnect>
<completed>.
This sequence is used when disconnection is allowed.
:= <initiator-part> <message-out> <command> <completed>.
This sequence is used when disconnection is not allowed.
32-5 Tandberg SLR Product Line SCSI Functional Specifications
the last block
. The Valid (VADD) bit will be set
between the
will reside on
Write Filemarks
transferred
requested number
the tape, ensuring
O
ND F
is
of
D
ATA