Re: [rdiff-backup-users] Error "Unable to compare" BUT THEN"Nochanges found. Directory matches." What?

[Steven Willoughby]

On 08/11/2010 08:03 PM, Robinson, Eric wrote:
> >  I've never tried using --compare-hash.
> >  There has been a lot of talk in the past about how to
> >  verify backups and really for me the only full proof solution
> >  is to restore somewhere and compare (diff) against original.
> Unfortunately, I am talking about directories with up to 2 million files
> each. I can't really afford (in terms of time or storage) to copy the
> data from the backup server to the source servers and compare it that
> way. Is there no way to do a good in-place comparison?

The rdiff-backup comparison should work if you're using a recent 
rdiff-backup on both ends.  (As mentioned in my last email.) If you only 
care about comparing with the most recent backup then you could probably 
do something like:

rsync -azv --del --dry-run --exclude=rdiff-backup-data/ $source/ $backup/

This should print out a list of all files that have changed.  To do a 
full comparison you'll want to add -I.

Steven

P.S.  In the past I have also done this with something like the following:

find $source -type f -exec md5sum {} \; | sort -k 2 > /tmp/source
find $dest -type f -exec md5sum {} \; | sort -k 2 > /tmp/dest
diff /tmp/source /tmp/dest