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
lesmikes...@gmail.com
