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-
-                            amtapetype
-Prev  Chapter 36. The Amanda Manual Pages.  Next
-
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-
-Name
-
-amtapetype  generate a tapetype definition.
-
-Synopsis
-
-amtapetype [-h ] [-c ] [-o ] [-b blocksize] -e estsize [-f tapedev] [-
-t typename]
-
-DESCRIPTION
-
-amtapetype generates a tapetype entry for Amanda.
-
-OPTIONS
-
-
-
-  -h
-      Display an help message.
-
-  -c
-      Run only the hardware compression detection heuristic test and stop. This
-      takes a few minutes only.
-
-  -o
-      Overwrite the tape, even if it's an Amanda tape.
-
-  -bblocksize
-      record block size (default: 32k)
-
-  -eestsize
-      estimated tape size (No default!)
-
-  -ftapedev
-      tape device name (default: $TAPE) The device to perform the test.
-
-  -ttypename
-      tapetype name (default: unknown-tapetype)
-
-
-EXAMPLE
-
-Generate a tapetype definition for your tape device:
-
-% amtapetype -f /dev/nst0 -e 150G
-
-NOTES
-
-Hardware compression is detected by measuring the writing speed difference of
-the tape drive when writing an amount of compressable and uncompresseable data.
-It does not rely on the status bits of the tape drive or the OS parameters. If
-your tape drive has very large buffers or is very fast, the program could fail
-to detect hardware compression status reliably.
-During the first pass, it writes files that are estimated to be 1% of the
-expected tape capacity. It gets the expected capacity from the -e command line
-flag, or defaults to 1 GByte. In a perfect world (which means there is zero
-chance of this happening with tapes :-), there would be 100 files and 100 file
-marks.
-During the second pass, the file size is cut in half. In that same fairyland
-world, this means 200 files and 200 file marks.
-In both passes the total amount of data written is summed as well as the number
-of file marks written. At the end of the second pass, quoting from the code:
-* Compute the size of a filemark as the difference in data written between pass
-1 and pass 2 divided by the difference in number of file marks written between
-pass 1 and pass 2. ... *
-So if we wrote 1.0 GBytes on the first pass and 100 file marks, and 0.9 GBytes
-on the second pass with 200 file marks, those additional 100 file marks in the
-second pass took 0.1 GBytes and therefor a file mark is 0.001 GBytes (1 MByte).
-Note that if the estimated capacity is wrong, the only thing that happens is a
-lot more (or less, but unlikely) files, and thus, file marks, get written. But
-the math still works out the same. The -e flag is there to keep the number of
-file marks down because they can be slow (since they force the drive to flush
-all its buffers to physical media).
-All sorts of things might happen to cause the amount of data written to vary
-enough to generate a big 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.
-It also explains why amtapetype used to sometimes report a negative file mark
-size if the math happened to end up that way. When that happens now we just
-report it as zero.
-
-SEE ALSO
-
-amanda(8)
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-
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-