If your full backups are taking more than 24 hours its time to get more and
faster hardware (ie network, tape drives, slaves etc). Management loves to
hear that :)

As for the pre-emptive scheduling I can't think of a way to dynamicly do it
unless you want to resort to cron jobs. Check to see if anything is running
at a given time, if it is then assume your full is running long and run kill
the incremental jobs. It would be quite a bit of work identifying and
killing the processes or jobs responsible for the incrementals.

-----Original Message-----
From: Jonathan Meyer [mailto:jmeyer AT ptc DOT com]
Sent: Tuesday, October 17, 2000 12:43 PM
To: John_Wang AT enron DOT net
Cc: veritas-bu AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] Preemptive scheduling



Regarding your question about pre-empting incremental backups if the
full schedule runs long.  I think "the right thing" to do is less
clear than one might think.

You might have data which you want protected on tape every 12 hours.
The incrementals might not take very long, but the fulls might take
more than 24 hours.  In this situation you would want one or more
incrs to take place during the full backup.  Performance of both
backups would be effected, but you would get a save to tape every 12
hours.  It is my understanding that the netbackup scheduler was
designed to handle the above scenario.

I don't mean to sound like an apologist for veritas, and I have never
wanted the functionality described, but I don't think the scheduler
behavior is as clearly "wrong" as it might seem at first.

--------------------------------------------------
Jonathan Meyer
(781)398-6594
UNIX Systems Administrator
Paramtric Technology Corporation
--------------------------------------------------



   From: John_Wang AT enron DOT net
   Date: Fri, 13 Oct 2000 17:18:30 -0500
   Sender: veritas-bu-admin AT Eng.Auburn DOT EDU
   List-Id: Discussion of Veritas Inc. backup related products
<veritas-bu.mailman.eng.auburn.edu>

   Hello

   Well, seeing how unsuccessful trying to see if anyone managed to do
conditional
   expirations was, here's another of my backup favourites.

   Can Netbackup do preemptive scheduling?

   i.e.: if a full backup is running long (which full backups tend to do)
and
   therefore into the window for a scheduled incremental for the same drive,
there
   is no real need for the incremental to run since the full is really in
the same
   time frame anyway so the incremental should be preempted by the full
backup of
   the same drive.

   Can Netbackup scheduling be configured to do this and if so how?

   Regards,
   John I Wang
   Sr. Systems Engineer
   Steverson Information Professionals

   ---
   Enron Broadband Services
   3 Allen Center, Room 337C
   PH (713) 345-6238


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