Networker

Re: [Networker] Too(?) much data in incremental savesets

2003-07-07 10:51:38
Subject: Re: [Networker] Too(?) much data in incremental savesets
From: Robert Maiello <robert.maiello AT MEDEC DOT COM>
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Date: Mon, 7 Jul 2003 10:51:32 -0400
Is the 100-200 GB L5/L6 backup comprised of unix data or Windows data?

NT and W2K with default behavior will back the same data up every day
until a full backup is done (which resets the archive bit).


Robert Maiello
Thomson Healthcare



On Sat, 5 Jul 2003 01:41:13 +0200, Oscar Olsson <spam1 AT QBRANCH DOT SE> wrote:

>I have noticed that when we perform certain incremental backups, there is
>a lot of data being backed up, even though a minimal part of the data has
>been changed. This is also true for NDMP backups of a NetApp filer.
>
>Basically, Out of 300GB data, I might back up 100-200GB data over one day,
>when day1 is a level5 backup and the next day is a level6 backup. I know
>that the data hasn't changed that much on the filer. What could the reson
>be?
>
>We're running data ontap 6.3.x and networker 6.1.3 on solaris 7. NDMP
>protocol version is 3. The scedule works like this: day 1: full, day 2:
>level 1, day 3: level 2, day 4: level 3, day 5: level 4, day 6: level 2
>... and so on, in order to be able to do a more or less incremental backup
>every day, even though the incr level isn't supported for NDMP (AFAIK).
>We're doing a full backup on the 7:th of each month.
>
>So what causes a file to be backed up again? Normal read file access
>(atime)? Or is it just when it has been modified or some kind of archive
>bit is set? We do scheduled anti-virus scanning of the filesystems, could
>that affect what gets backed up, even though the scanner just reads the
>files?
>
>//Oscar
>
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