amtapetype man page on Oracle

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AMTAPETYPE(8)		System Administration Commands		 AMTAPETYPE(8)

       amtapetype - generate a tapetype definition by testing the device

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

       amtapetype generates a tapetype entry for Amanda by testing the device

	   The options for amtapetype have changed in version 2.6.1

	   Display the help message.

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

	   Run amtapetype even if the loaded volume is already labeled.

	   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

       Generate a tapetype definition for your tape device:

	   % amtapetype -f /dev/nst0

       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

       amanda(8), amanda.conf(5)

       The Amanda Wiki: :

       Dustin J. Mitchell <>
	   Zmanda, Inc. (

       Jean-Louis Martineau <>
	   Zmanda, Inc. (

Amanda 3.3.3			  01/10/2013			 AMTAPETYPE(8)

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