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Re: UNS: Re: Taking mirror Backup of SVN Repos through 3rd Party Software

From: Les Mikesell <lesmikesell_at_gmail.com>
Date: Thu, 30 Jun 2011 11:35:17 -0500

On 6/30/2011 10:46 AM, Andreas Krey wrote:
> On Thu, 30 Jun 2011 10:09:43 +0000, Les Mikesell wrote:
> ...
>> A backup made in an inconsistent state should exactly resemble the disk
>> files if the system lost power or crashed for another reason at that
>> point.
> No, backups can contain inconsistencies that are impossible to
> create with a server crash. When, say, the svn server writes
> file A and B with a synchonization point in between, it is
> still possible for a backup to contain the old A and the new B.
> This can't happen in a crashed filesystem.

I think you are being way too optimistic about real-world filesystems
and disk and controller caches. It is possible to make a system that
behaves with the ideal behavior you describe - and maybe many do in
terms of the filenames and directory entries. But I'd guess that the
majority don't really get this right with the data contents of those files.

   Les Mikesell
Received on 2011-06-30 18:35:58 CEST

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