User Guide

B-22 Ampex 1308911-02
Model No.
Running Head
Introduction Device Special Files
DST_NO_REFORMAT
No tape reformatting
(Ox0000400)
On — Prevents reformatting of tapes.
Off — Allows reformatting of tapes.
DST_NO_RESERVE
No reserve (Ox0000800)
On — Allows multiple hosts to use the tape drive concurrently.
Off — Reserves the tape drive for exclusive use by the initiator.
DST_NO_REWIND
No rewind on close
(Ox0000001)
On — Does not change the current position on close.
Off — A rewind command is issued on close to set the current position to BOP of
the current partition.When this parameter is set to off, it overrides the
DST_SPC_FWD parameter . When this parameter is set to on, it is overridden
by the DST_SPC_FWD parameter
Note: When this parameter is set to off, it overrides the DST_SPC_FWD parameter.
When this parameter is set to on, it is overridden by the DST_SPC_FWD
parameter.
DST_OPEN_RDONLY
Open for read only
(Ox0010000)
Set to on by the O_RDONLY open flag:
• When set to on, enables reading from tape only.
• When set to off, enables both reading from tape and writing to tape.
DST_RETEN_OPN
Rewind on open
(Ox0000040)
On — If the current position is undefined, a load command is issued to set the
current position to BOT. Otherwise a rewind command sets the current position to
the BOP of the current partition.
Off — The current position is not changed during open.
Note: When this parameter is set to on, it overrides the DST_DEF_POS_OPN
parameter.
DST_SBLK_SIZE
Set user defined block
size on open
(Ox0000020)
On — Implements the user-defined block size on open. This is the block size
specified in the device special file configuration file.
Off — Retains the current block size on open.
DST_SPC_FWD
Space forward on close
(Ox0000080)
On — If a file was partially read and close is called, the current position is spaced
forward to the next file unless the DST_NO_REWIND parameter is set to off.
Off — If a file was partially read and close is called, the current position is
maintained within the file.
Note: When the DST_NO_REWIND parameter is set to off, it overrides this
parameter. When the DST_NO_REWIND parameter is set to on, it is
overridden by this parameter
Table B-8. Device Special File Interface Parameter Description (Continued)
Mnemonic
Name (Bit Location)
Description