Re: FW: Update Catalogue file from diff files.

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Hi Dan,

In complement to Stefan's hint, you can speedup the first
step, by doing a snapshot instead of a full backup that you just drop
afterward. A snapshot is equivalent to an isolated catalogue of a just
run full backup, see -A option for all details, but in short:

	dar -c <snapshot> -A + -R <source> ...

eventually also making an on-fly isolated catalogues for the following
steps, can make the operation even more efficient:

	dar -c <diff-backup> -A <ref_catalogue> -R <source> -@
<new_catalogue> ...

My two cents,

Cheers,
Denis


On 18/01/2021 18:10, Stefan Hammerl via Dar-support wrote:
> Hi Dan,
>
> do you know the merge-command?
>
> In your case you could either merge to subsequent incremental
> archives or merge the incremental archive with the baseline: dar
> --merge <output_archive> -A <diff_file_or_base> -@
> <next_diff_file> --overwrite-policy "{-I}[Oo][Rr]" --no-warn
>
> The overwriting policy is used to also delete files in the base
> archive (<diff_file_or_base>) when they are marked as deleted in
> the next_diff_file. Read the man page for details.
>
> If a new archive is created you can delete diff_file and
> next_diff_file and probably rename output_archive properly.
>
> Best regards, Stefan
>
> Daniel Cox <[email protected]
> <mailto:[email protected]>> schrieb am Mo., 18. Jan.
> 2021, 05:43:
>
> Sorry first attempt to send had formatting issues:
>
> Hi everyone,
>
> This is my first post so I hope I am doing it right...
>
> I am using DAR to create a mirror of data from one data store to
> another. I only ever need to send the latest diff files across the
> network to the second store and because of this I have decided to
> use a catalogue and differential backups on the source. I want to
> minimise the space that DAR uses on the source system. My process
> is like this:
>
> 1. Take baseline backup of whole system
>
> 2. Generate catalogue file from baseline backup (then delete
> baseline backup)
>
> 3. Generate first differential backup from catalogue and source
>
> dar -c <diff-backup-name> -A <catalogue> -R <source>
>
> 4. Generate subsequent backups from differential files
>
> dar -c <diff-backup-name> -A <previous-diff-file> -R <source>
>
> The issue is that the number of diff files that I need to retain
> on the source system seems to increase quite quickly.
>
> My questions are: 1. Can I somehow add the meta data in the diff
> backups that are generated back to the catalogue so that I don't
> have to keep the relatively heavy diff files around? 2. Is what I
> am doing the right thing or perhaps there's an easier way?
>
> Thanks a bunch!
>
> Dan.
>
>
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>
>
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