I setup two identical policies on my master server TEST1 and TEST2 and
pointed them at one of my Linux servers, at a specific test directory
/test.  I then touched two files, test1 and test2 in that directory and
fired off TEST1 w/ a FULL.  It backed up both files.  The, without
modifying these files I fired off the TEST2 policy with the same
selection list but an incremental.  Theoretically if it was using the
same date/time stamp for the last "full" it shouldn't backup these two
files again.  Unfortunately it did, so it would appear that the
date/time stamp method used by NBU is policy specific?

Can anyone confirm?

-Jonathan

-----Original Message-----
From: veritas-bu-bounces at mailman.eng.auburn.edu
[mailto:veritas-bu-bounces at mailman.eng.auburn.edu] On Behalf Of Darren
Dunham
Sent: Tuesday, August 29, 2006 3:39 PM
To: Veritas-bu at mailman.eng.auburn.edu
Subject: Re: [Veritas-bu] Clarification - Policies

> The archive bit which the full and differential backups clear is a 
> facility of the file system.  Whether you are running NTFS or EXT3 the

> archive bit is kept per file at the file system level.

I have never heard of ext3 (or any unix filesystem) with an archive bit.
Did you mean NTFS and FAT? 

> It doesn't
> matter WHAT backup software you use to clear the archive bit, 
> incremental backups will only backup files with the archive bit set 
> and fulls will backup EVERYTHING.  The only difference is that full 
> and differential backup RESET the archive bit if it is set.  
> Essentially, anytime you change a file (open it, save it) the archive 
> bit gets set to "1" or "please back me up."  When a full or 
> differential backup comes along it backs up the file and clears the 
> archive bit.  This really has nothing to do with Netbackup or 
> policies.  You can run simple backups via windows backup and it still 
> uses the same archive bit.  At one point I was using WinZip to clear 
> archive bits and rub remote backups while a tape library was down.

Or you can ask netbackup to not use the archive bit.

-- 
Darren Dunham                                           ddunham at taos.com
Senior Technical Consultant         TAOS            http://www.taos.com/
Got some Dr Pepper?                           San Francisco, CA bay area
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