Amanda-Users

Re: Backing up to disk w/compression failing.

2003-10-21 11:28:51
Subject: Re: Backing up to disk w/compression failing.
From: Paul Bijnens <paul.bijnens AT xplanation DOT com>
To: kend AT xanoptix DOT com
Date: Tue, 21 Oct 2003 17:22:00 +0200
kend AT xanoptix DOT com wrote:

Otherwise, I get all sorts of errors... damn!  Unfortunately, my log just
got wiped during a reboot.  Going from memory, here are the "symptoms:"

Anyway, some exact errormessages really help a lot. Try to reproduce it. Mentioning the versions of the programs used, also helps.


dd if=filename.tar bs=32k skip=1 | gzip -cd | tar xvf -
dd if=filename.tar bs=32k skip=1 | tar zxvf -

And does this work or has the same problem?
Maybe the filename.tar file just plain corrupt?


Any suggestions?  Right now, I'm doing my backups w/o compression, and
it's working fine, but I'd really like to be able to make my media go the
extra distance that compression would allow.

Somehow (but without sufficient information) I would not rule out
hardware problems.  The fact that compressed backups do not work, is
just the result that those files are much more fragile: one bit change
is enough to invalidate all the following bytes.
Are you sure the normal backups do not have a bit changed somewhere?
Try doing a restore and then an md5sum of the files and/or compare
with originals.

--
Paul Bijnens, Xplanation                            Tel  +32 16 397.511
Technologielaan 21 bus 2, B-3001 Leuven, BELGIUM    Fax  +32 16 397.512
http://www.xplanation.com/          email:  Paul.Bijnens AT xplanation DOT com
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