[BBLISA] dump or Legato Networker?

[Dean Anderson]

On Mon, 12 Nov 2007, John Stoffel wrote:

> Well, the general issue is open files.  And files created after the
> backup process starts.  
> 
> For example, if you are doing an incremental backup of just the files
> that changed since the previous backup, you need to do two passes.
> Well, not quite, you can optimize it, but there's definitely a window
> where a file can be created (or deleted!) between the initial scan of
> the directory and the actual reading of the file to be sent to tape,
> disk, whatever.

This is why dump manpage says the filesystem should be quiecent.  
Unmounted and clean is best, but not required. Shutdown the database
before dump; start it after dump.  Other user activity is usually just
hit or miss, and the users don't mind just too much (well, don't tell
them that when they've just lost their important file, unless behind 3
inches of plexiglass--bofh). This is why people want snapshots in
filesystems...

Fix ext3, ffs, and ufs to have even just one snapshot (like afs), and
they'd be a hero loved by all... But its probably easier to rig the
lottery...

		--Dean


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