Just a note on this:
There needs to be a tape in the drive when you execute that command...at
least on my drives.
Anyone have any further info on this?

YEah that's a severe brokenness of Linux 2.6.

My drives are AIT35 autoloaders.

Regards,
Gordon

-----Original Message-----
From: owner-amanda-users AT amanda DOT org
[mailto:owner-amanda-users AT amanda DOT org] On Behalf Of Michael Loftis
Sent: Tuesday, May 02, 2006 2:21 PM
To: Guy Dallaire; amanda users list
Subject: Re: Disabling LTO-2 hardware compression

mt -f <st device> datcompression 0

That should work but it will likely come back on after a
restart though.

--On May 2, 2006 10:17:48 AM -0400 Guy Dallaire
<clepeterd AT gmail DOT com> wrote:

> Hi,
>
> Recently added an Overland LoaderXpress LTO 2 tape library
to my setup.
> Inside the loader is an OEM HP Ultrium tape drive. My tape
server is a
> centos 4.2 box (RHEL 4 clone)
>
> I'm using software compression with amanda 2.4.5p1 already.
>
> Problem is, the tape drive in the library always seems to have
> hardware compression ON. There is no way on the library
operator panel
> to force the compression OFF.
>
> I've heard that LTO2 drives can easily cope with already compressed
> data (and do not try to re compress it). Is this true ?
Otherwise, I
> fear that trying to compress already compressed data might actually
> use more tape space and reduce throughput.
>
> I've searched the amanda wiki and di not find anything.
>
> Has anyone devised a way to force hw compression off on a
similar setup ?
>
> Thanks



--
"Genius might be described as a supreme capacity for getting
its possessors into trouble of all kinds."
-- Samuel Butler

--
"Genius might be described as a supreme capacity for getting its possessors
into trouble of all kinds."
-- Samuel Butler