User Guide

B-6 Ampex 1308911-02
Model No.
Running Head
Introduction Device Special Files
Default Actions While Open
/dev/rmt*.0
/dev/rmt*.1
/dev/rmt*.2
/dev/rmt*.4
/dev/rmt*.6
DST_APPEND_ONLY-
Off
Allows writing at any position up to and including EOD (even if it results in
overwriting of previously recorded data).
DST_NO_REFORMAT- Off
Allows reformatting of tapes.
DST_IGN_FM - Off
If a filemark is encountered during the first read command after open and no data
was transferred, zero bytes are returned after encountering the filemark.
DST_NO_FLUSH - Off
Filemarks written to tape are not buffered.
DST_ZERO_ON_FM — Off
When a filemark is detected during a read operation, returns the number of bytes
read and sets the current position to after the filemark. The next read operation
gets data from the next file (if not at End of Data or a null file).
Note: The application can recognize the filemark detected by retrieving and
diagnosing the Request Sense data.
DST_ZERO_ON_EW — Off
If Early Warning is encountered during a write operation, tries to flush the tape
drive buffer to tape.
• If successful, returns -1 with errno set to ENOSPC to signify that all data in the
buffer was flushed to tape and the tape/partition is full.
• If unsuccessful, returns the number of bytes written to tape.
/dev/rmt*.3
/dev/rmt*.5
/dev/rmt*.7
DST_APPEND_ONLY, DST_NO_REFORMAT, DST_IGN_FM, DST_ZERO_ON_FM and
DST_ZERO_ON_EW
Same as rmt*.0 above.
DST_NO_FLUSH - On
Filemarks written to tape are buffered.
Table B-4. AIX Device Special Files Default Actions (Continued)
Device Special File Interface Parameter Setting and Action Performed