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Operating Systems AIX Ejecting tape on AIX & Some Tape commands Post 302650131 by filosophizer on Friday 1st of June 2012 02:38:35 PM
Old 06-01-2012
[Solved] Ejecting tape on AIX & Some Tape commands

I am trying to use this command to eject the tape
Code:
mt -f /dev/rmt/0 unload

but it gives me error
Code:
 mt -f /dev/rmt/0 unload
mt: 0511-575 unload is not a recognized subcommand.
Usage:  mt [-f Device] Subcommand [Count]
        Valid subcommands are:
        weof
        eof
        fsf
        bsf
        fsr
        bsr
        rewind
        offline
        rewoffl
        status

or
Code:
tctl -f /dev/rmt0 offline
/dev/rmt0: The device is not ready for operation.

But the tape is inside the drive !

some other tape commands

Getting information about the tape. It is using compression and a variable length block size


Code:
tctl -f /dev/rmt0 status

Rewinding tape drive
Code:
tctl -f /dev/rmt0 rewind

Rewind and eject the rmt0 tape drive
Code:
# tctl -f /dev/rmt0 offline


Check the content of the tape
Code:
#tctl -f /dev/rmt0.1 -b 1024 -n read

Reading tape and redirecting output to a file. In this case, the operating system showed that the tape itself is damaged.
Code:
tctl -f /dev/rmt0 read > /tmp/testtape

Getting info about the tape
Code:
lscfg -vpl rmt0

 

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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)
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