Jeffrey J. Kosowsky wrote:
>
> > > Name the top 10 that worry you most so that I can get a feeling for
> > > how hard they are to solve. Again, I can't address a generic fear.
> >
> > 1) you've run out of disk space, corrupting the database
> Would cause similar problem with current implementation - such that
> either attrib files not created or links not created between pc and
> pool trees or only partial files transferred.
But it doesn't break/disassociate your view of what you have or don't have.
> Similar solution would
> be to have a variable like current DfMaxUsagePct to make sure that
> backup doesn't run (or stops gracefully) if filesystem close to
> full.
But now you also need to know what filesystem(s)hold the database tables
- if they are on the same machine where you can even check.
Also, all databases need to deal with such issues so it is
> hardly a new problem without reasonable solution.
It's not a new issue for experienced DBA's. Some of them might even
know how to recover a corrupted database. But it's a new problem for
backuppc users.
> > 2) you lose power/crash while expiring
> This would just mean that expiry not completed meaning that some
> expired files not deleted. Same problem occurs if power/crash during
> BackupPC_Nightly. The actual deletion is atomic. Just run expiry again.
The actual deletion can't be atomic - you have to one thing in the
database and one thing in the filesystem.
> Interestingly, though you don't list the one issue that could be more
> of a fundamental problem which is that a major database corruption
> could lose your entire backup database.
That was the point of #1. Anything that lets the db become different
than the filesystem means it won't work or won't be able to restore what
you think you have.
--
Les Mikesell
lesmikes...@gmail.com
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