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na_mt - Command for magnetic tape positioning and control
mt { -f | -t } tapedevice command [ count ]
mt is used to position or control the specified magnetic
tape drive supporting the commands listed below. Commands
that support a count field allow multiple operations to be
performed (the rewind, status, offline, erase and eom
commands do not support a count field). mt will output
failure messages if the specified tape drive cannot be
opened or if the operation fails.
The -f option specifies which tape device to use. Use
sysconfig -t to list all tape devices on the node. -t has
the same effect as -f.
- eof, weof
- Writes count end-of-filemarks beginning at
the current position on tape.
- fsf
- Forward spaces over count filemarks.
Positions the tape on the end-of-tape side of
the filemark.
- bsf
- Backward spaces over count filemarks.
Positions the tape on the beginning-of-tape
side of the filemark.
- fsr
- Forward spaces count records. Positions the
tape on the end-of-tape side of the
record(s).
- bsr
- Backward spaces count records. Positions the
tape on the beginning-of-tape side of the
record(s).
- erase
- Erases the tape beginning at the current tape
position. When the erase completes, the tape
is positioned to beginning-of-tape.
- rewind
- Rewinds the tape, positioning the tape to
beginning-of-tape.
- status
- Displays status information about the tape
unit. If you have a tape device that NetApp
Inc has not qualified, you must use the
following command syntax to access the tape
device before the node can register the tape
device as a valid clone of a qualified
device:
mt -f device status
After the node accesses the tape device, you
can use the sysconfig -t command to display
information about the device emulation.
- offline
- Rewinds the tape and unloads tape media.
- diag
- Enables or disables display of diagnostic
messages from tape driver. Enabling
diagnostic messages can be helpful when
attempting to diagnose a problem with a tape
device. Specifying a count of "1" enables
display of diagnostic messages, a count of
"0" disables diagnostic messages. Diagnostic
messages are disabled by default.
- eom
- Positions the tape to end of data (end of
media if tape is full).
The following example uses mt to display status
information for the no-rewind tape device, unit zero,
highest format (density):
toaster> mt -f nrst0a status
Tape drive: Exabyte 8505 8mm
Status: ready, write enabled
Format: EXB-8500C (w/compression)
fileno = 0 blockno = 0 resid = 0
To skip over a previously created dump file to append a
dump onto a no-rewind tape device, use the fsf (forward
space file) command:
toaster> mt -f nrst0a fsf 1
In takeover mode, the failed node has no access to its
tape devices. If you enter the mt command in partner
mode, the command uses the tape devices on the live node.
na_partner(1), na_sysconfig(1), na_tape(4).
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