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Re: [rdiff-backup-users] Verification takes too long
From: |
Matthew Flaschen |
Subject: |
Re: [rdiff-backup-users] Verification takes too long |
Date: |
Thu, 22 Jan 2009 19:25:16 -0500 |
User-agent: |
Thunderbird 2.0.0.19 (X11/20090105) |
Fedor Piecka wrote:
> The backup of the most used
> machines (they also have the largest amount of data to backup) takes
> about 30 minutes. But after that, the verification takes about 12
> hours.
>
> Is this normal?
Yes. I think so. The backup obviously only does work on changed files,
but verify reads every file in the repository in its entirety and
computes a SHA-1 hash. This is unavoidably going to take a very long time.
Perhaps there should be an option to verify only files that have changed
during the most recent backup (--verify-last?). The problem here is if
your backup drive goes flaky. Then, files that /shouldn't/ have changed
on the backup drive may nonetheless be corrupted by an errant write
without verify-last noticing.
Matt Flaschen