---

From: "Donaldson, Mark" <Mark.Donaldson AT Staples DOT com>
To: Randy Doering <rdoering2 AT verizon DOT net>; A Darren Dunham <ddunham AT taos DOT com>; Veritas-bu AT mailman.eng.auburn DOT edu
Sent: Wednesday, December 10, 2008 6:37:52 PM
Subject: RE: [Veritas-bu] Full backup followed by a Differential= Another Full

Netbackup, by default, uses mtime for incrementals.  It can be
configured to use C-time in bp.conf but that's not usual at all.

More here: http://seer.support.veritas.com/docs/200644.htm

-M

-----Original Message-----
From: veritas-bu-bounces AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of Randy
Doering
Sent: Wednesday, December 10, 2008 3:42 PM
To: A Darren Dunham; Veritas-bu AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] Full backup followed by a Differential=
Another Full

Mystery solved - or so it seems.

Last week we had a helpdesk ticket where the user wanted some
chmod/chgrp
modifications of all files/directories in this area.

My co-worker did that on Thursday/Friday of last week. Seems this
changes
the ChangeTime (ctime), which NBU is using for determining if something
has
"Changed". I then did a Differential, and it was looking at the ctime.

For one of the files:

stat error.txt
  File: `error.txt'
  Size: 338713          Blocks: 962        IO Block: 4096  regular file
Device: 1dh/29d Inode: 4365470520  Links: 1
Access: (0664/-rw-rw-r--)  Uid: ( 2370/  cgoina)  Gid: (
9003/jtc-solexa)
Access: 2008-10-15 09:44:41.235029187 -0400
Modify: 2008-10-15 09:44:41.235029187 -0400
Change: 2008-12-09 19:00:21.895757388 -0500

Turns out, the chmod/chgrp needed to be rerun on Monday/Tuesday this
week.

Is there a way for NBU to look at mtime instead of ctime?

Thanks,
Randy



----- Original Message -----
From: "A Darren Dunham" <ddunham AT taos DOT com>
To: <Veritas-bu AT mailman.eng.auburn DOT edu>
Sent: Wednesday, December 10, 2008 11:23 AM
Subject: Re: [Veritas-bu] Full backup followed by a Differential =
Another
Full


> On Wed, Dec 10, 2008 at 07:42:41AM -0800, Randy Doering wrote:
>> Backup Client = Isilon NAS Unit - NDMP. NBU version is 6.5.3.
>
>> With this?one (10+TBs, 1,643,099 files) during the backup NBU said it
>> was doing a Differential, but when it was all done, it had actually
>> backedup everything again.
>
>> If I kick off another Differential this coming weekend, I certainly
>> don't want to have yet another backup that gets all of the data once
>> again.
>>
>> Any thoughts?
>
> Since this is NDMP, Netbackup isn't making any of the file level
> decisions.  It's just passing a set of parameters to the host (dump
> level, date of backup, file path, tape drive, etc...) and letting the
> make the selections.
>
> I don't have it in my notes, but you can up the log level of ndmp on
the
> isilon and view exactly what NBU is sending over.  It'll show up in
the
> ndmp logs.  Ah.  Found my notes...
>
> On any node of the cluster, edit the file
/etc/mcp/templates/syslog.conf
> and change the line:
> *.>=info /var/log/isi_ndmp_d
> to:
> *.* /var/log/isi_ndmp_d
> This should increase the logging levels on the cluster for ndmp.
>
> You may want to check with your support contacts before doing this,
but
> it's just a log level change.
>
> With that in place, you can start a manual differential and see what
it
> looks to be doing.  You'll be able to kill it so it won't consume
tapes
> for you.  If nothing looks obviously wrong, you may have to contact
> support.
>
> Good luck!
>
> --
> Darren
> _______________________________________________
> Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
> http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu

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