02-19-2002
Ok,
I Experienced this problems before. You may try with this steps.
If you can tar cvf /dev/rStp0 .(or rStp1 if this was the second drive), but cannot do "tape" commands, then run mkdev tape again and select the default tape drive. Or for a quicker test:
rm /dev/xct0
mknod /dev/xct0 c 46 128 (assuming rStp0)
and then try "tape status" etc.
For tapes, the minor number for ioctl is 128. The ioctl devices are /dev/xct0, /dev/xStp0, etc. If you have created a SCSI tape, but didn't set it as default, then the /dev/xct0 is
crw-r--r-- 1 root sys 10,128 Sep 21 10:35 /dev/xct0
which has the right minor number, but the major (10) is for a cartridge tape, not SCSI.
You could fix this as suggested above, or by editing /etc/default/tape and changing the
device = /dev/xct0
to
device = /dev/xStp0
Give a try first, let me know if this helps.
Works for me.
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MT(1) General Commands Manual MT(1)
NAME
mt - magnetic tape manipulating program
SYNOPSIS
mt [ -f tapename ] command [ count ]
DESCRIPTION
Mt is used to give commands to a magnetic tape drive. If a tape name is not specified, the environment variable TAPE is used; if TAPE
does not exist, mt uses the device /dev/rmt12. Note that tapename must reference a raw (not block) tape device. By default mt performs
the requested operation once. Operations may be performed multiple times by specifying count.
The available commands are listed below. Only as many characters as are required to uniquely identify a command need be specified.
eof, weof
Write count end-of-file marks at the current position on the tape.
fsf Forward space count files.
fsr Forward space count records.
bsf Back space count files.
bsr Back space count records.
rewind Rewind the tape (Count is ignored).
offline, rewoffl
Rewind the tape and place the tape unit off-line (Count is ignored).
status Print status information about the tape unit.
cacheon
Enable the readahead/writebehind cache on the tape unit.
cacheoff
Turn off the readahead/writebehind cache on the tape unit.
Mt returns a 0 exit status when the operation(s) were successful, 1 if the command was unrecognized, and 2 if an operation failed.
The cacheon and cacheoff commands currently only apply to the TMSCP driver and then only for certain drives such as the TU81+. No error is
produced by the TMSCP driver if the cache commands are used. Other drivers will return an error code since they do not recognize the
MTCACHE and MTNOCACHE functions codes. See mtio(4).
FILES
/dev/rmt* Raw magnetic tape interface
SEE ALSO
mtio(4), tmscp(4), dd(1), ioctl(2), environ(7)
4th Berkeley Distribution December 22, 1995 MT(1)