NAME

       amtapetype - generate a tapetype definition by testing the device directly

SYNOPSIS

       amtapetype [-h] [-c] [-f] [-p] [-b blocksize] [-t typename] [-l label]
                  [-o configoption...] [config] [device]

DESCRIPTION

       amtapetype generates a tapetype entry for Amanda by testing the device directly.

OPTIONS

           Note
           The options for amtapetype have changed in version 2.6.1

       -h
           Display the help message.

       -c
           Run only the hardware compression detection heuristic test and stop. This takes a few
           minutes only.

       -f
           Run amtapetype even if the loaded volume is already labeled.

       -p
           Run only the device property discovery.

       -b blocksize
           block size to use with the device (default: 32k)

       -t typename
           Name to give to the new tapetype definition.

       -l label
           Label to write on the tape (default is randomly generated).

       -o configoption
           See the "CONFIGURATION OVERRIDE" section in amanda(8).

       If a configuration is specified, it is loaded and used to configure the device. Note that
       global configuration parameters are not applied to the device, so if you need to apply
       properties to a device to run amtapetype, you should supply those properties in a named
       device section.

EXAMPLE

       Generate a tapetype definition for your tape device:

           % amtapetype -f /dev/nst0

NOTES

       If the device cannot reliably report its comprssion status (and as of this writing, no
       devices can do so), hardware compression is detected by measuring the writing speed
       difference of the tape drive when writing an amount of compressable and uncompresseable
       data. If your tape drive has very large buffers or is very fast, the program could fail to
       detect hardware compression status reliably.

       Volume capacity is determined by writing one large file until an error, interpereted as
       end-of-tape, is encountered. In the next phase, about 100 files are written to fill the
       tape. This second phase will write less data, because each filemark consumes some tape.
       With a little arithmetic, amtapetype calculates the size of these filemarks.

       All sorts of things might happen to cause the amount of data written to vary enough to
       generate a strange file mark size guess. A little more "shoe shining" because of the
       additional file marks (and flushes), dirt left on the heads from the first pass of a brand
       new tape, the temperature/humidity changed during the multi-hour run, a different amount
       of data was written after the last file mark before EOT was reported, etc.

       Note that the file mark size might really be zero for whatever device this is, and it was
       just the measured capacity variation that caused amtapetype to think those extra file
       marks in pass 2 actually took up space.

SEE ALSO

       amanda(8), amanda.conf(5)

       The Amanda Wiki: : http://wiki.zmanda.com/

AUTHORS

       Dustin J. Mitchell <dustin@zmanda.com>
           Zmanda, Inc. (http://www.zmanda.com)

       Jean-Louis Martineau <martineau@zmanda.com>
           Zmanda, Inc. (http://www.zmanda.com)