Frederic,
This is _generic_ information that may or may not apply to your
particular tape drive.
- Turning on/off hardware compression is specific to your tape drive,
not the changer.
- Look in the manual for a dip switch that may turn on/off the
compression.
- There's another dip switch that allows for software control of
hardware compression regardless of the position of the dip switch
described above.
- If the second dip switch is set to enable software control, you'll
be able to control the compression using the 'mt' command.
- Find the device file name of the tape drive (not the changer),
e.g. /dev/nst0
- To turn on hardware compression:
mt -f /dev/nst0 compress 1
- To turn off hardware compression:
mt -f /dev/nst0 compress 0
- The effect of your command lasts until the tape is ejected.
- If you plan on using compressionr a lot, you should set the default
behavior using the first dip switch described above.
- This is not Amanda-specific information, but might be appropriate
for inclusion in the amanda document. (Hint, hint.) :)
Hope that answers the question.
Ivan
Frederic Medery a e'crit:
> Hello, I'm using amanda with IBM 3581 tapechanger,
> my tapetypes.conf is :
>
> # IBM LTO Ultrium 3581 tape Charger
> define tapetype IBM-LTO3581 {
> comment "IBM LTO Ultrium 3581 (Hardware Compression off)"
> length 100608 mbytes
> filemark 0 kbytes
> speed 13120 kps
> }
>
>
> I'm gonna use dump instead of tar so I want to enable hardware
> compression, but I can'y find any in the amanda doc ?
>
> Some Hints ??
>
> Thanks !!!!
>
> --
> Frederic Medery
> System Administrator
>
> LexUM, University of Montreal
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