I have a different way of handling that
requirement.
From: Steven L. Sesar [mailto:ssesar AT mitre DOT org]
Sent: Wednesday, July 25, 2007
12:31 PM
To: Curtis Preston
Cc: Greenberg, Katherine (ISD,
IT); veritas-bu AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] Priority
w/ an External Scheduler?
The only other justification I can think of for using
an external scheduler, is, when there are batch processing operations against,
say, Oracle databases, which need to run during your backup window. Using
the same batch processing application, you can add a backup to the chain. This
is a very specific situation - backups of Oracle databases and batch processing
against said databases which need to occur during the same backup window.
We toyed with the idea, but in the end, we pushed back on the apps folks to fix
their apps, so chains would run quicker and run either before our backups
begin, or after they complete. We are currently considering hardware-based
snapshot capability and array-based replication, which will give our apps folks
back some time for chains to run.
--Steve
Curtis Preston wrote:
While I agree with Justin’s
response, I really don’t like using external schedulers for NetBackup
unless absolutely necessary. The only real requirement I can think of
that would force me to an external scheduler is multi-host dependencies,
because external schedulers are really good at that.
I’ve seen the following
justifications:
- I want
a backup job to run exactly at 3 AM.
- You
can do that with NBU, good windows, and dedicated resources.
- I
want to tell all my jobs exactly when to run.
- Why?
Stop over engineering your backup environment. Let go and let
Symantec. ;) You’ll be amazed at how well run a NBU
environment can be if you just give all your backups the same window, the
same resources, and just set priorities. It’s a beautiful
thing and requires VERY little maintenance.
- An
external scheduler is already hooked into our overall reporting mechanism.
- Lousy
excuse to cripple the NBU scheduler. Spend the time necessary to
hook NBU into your overall reporting mechanism.
Short of the one valid reason I’ve
seen (multi-host dependencies), you’ll never approach the level of
resource utilization and efficiency that the NetBackup scheduler can give you
by using an external scheduler. For example, while NBU can have thousands
of queued jobs waiting for resource (to make sure that something is always
using the tape drives) without consuming any additional resources, doing that
with an external scheduler is impossible.
Have you guys ever used an external scheduler?
I'm trying to figure out if that impacts Policy
Prioritization or not.
Since our backups aren't scheduled thru NetBackup
(there are schedules, but no windows) does prioritization come into play or no?
We're running 5.1 MP6.
TIA,
Kate
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--
===================================
Steven L. Sesar
Lead Operating Systems Programmer/Analyst
UNIX Application Services R101
The MITRE Corporation
202 Burlington Road - MS K101
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