I would love to have bzip2.
Josh Huston wrote:
> We can add it easily into configure.in to include a new configure option
> "--with-bzip2" to enable bzip2 instead of gzip. If you know how to work
> with autoconf tools and how to modify configure.in then feel free to add it
> in yourself.
>
> I'm currently working on a small project for Amanda and I could add it in
> for you if there are enough interest from everybody else. Unless J.R.
> Jackson wants to do that himself. :-)
>
> Josh
>
> John Goerzen wrote:
> >
> > Hi,
> >
> > I'd like to use bzip2 with amanda for two reasons:
> >
> > 1. It compresses a lot better than gzip
> >
> > 2. More importantly -- data recovery is possible from a damaged tape.
> >
> > >From bzip2's manual:
> >
> > bzip2 compresses files in blocks, usually 900kbytes long. Each
> > block is handled independently. If a media or transmission error
> > causes a multi-block .bz2 file to become damaged, it may be
> > possible to recover data from the undamaged blocks in the file.
> >
> > The compressed representation of each block is delimited by a
> > 48-bit pattern, which makes it possible to find the block
> > boundaries with reasonable certainty. Each block also carries
> > its own 32-bit CRC, so damaged blocks can be distinguished from
> > undamaged ones.
> >
> > With gzip and compress, in general, once a media error is encountered,
> > the entire remainder of the file (tar or dump in our case) is
> > unusable. This is why people generally shun gzip/compress for
> > backups, unless it's done on a per-file basis to lessen the severity
> > of errors. Of course, doing it on a per-file basis also lessens the
> > effectiveness ofcompression. The only tradeoff with bzip2 is CPU
> > time: it is more CPU-intensive than gzip or compress. However, when
> > reliability of backups is at stake, that's a tradeoff I'm quite
> > willing to take,
> >
> > In amanda, the configuration file seems to think that the user isn't
> > smart enough to manually specify a compression program :-) I'd much
> > rather specify "gzip -9" and "gunzip" than specify "best compression"
> > or whatnot. Are there any plans to support this? If there were, it
> > would be trivial to drop in bzip2 instead of gzip with amanda.
> >
> > Are there any plans to support this? I suppose I could just go into
> > the code with sed and s/gzip/bzip2/ but I'd prefer to do it more
> > elegantly if possible :-)
> >
> > -- John
> >
> > --
> > John Goerzen <[EMAIL PROTECTED]> www.complete.org
> > Sr. Software Developer, Progeny Linux Systems, Inc. www.progenylinux.com
> > #include <std_disclaimer.h> <[EMAIL PROTECTED]>
--
:wq!
---------------------------------------------------------------------------
Robert L. Harris | Micros~1 :
Unix System Administrator | For when quality, reliability
at Agency.com | and security just aren't
\_ that important!
DISCLAIMER:
These are MY OPINIONS ALONE. I speak for no-one else.
FYI:
perl -e 'print $i=pack(c5,(41*2),sqrt(7056),(unpack(c,H)-2),oct(115),10);'
