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:
1. I want a backup job to run exactly at 3 AM.
1. You can do that with NBU, good windows, and dedicated
resources.
2. I want to tell all my jobs exactly when to run.
1. 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.
3. An external scheduler is already hooked into our overall
reporting mechanism.
1. 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.
---
W. Curtis Preston
Backup Blog @ www.backupcentral.com <http://www.backupcentral.com>
VP Data Protection, GlassHouse Technologies
------------------------------------------------------------------------
*From:* [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] *On Behalf Of
*Greenberg, Katherine (ISD, IT)
*Sent:* Wednesday, July 25, 2007 10:55 AM
*To:* veritas-bu@mailman.eng.auburn.edu
*Subject:* [Veritas-bu] Priority w/ an External Scheduler?
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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===================================
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Lead Operating Systems Programmer/Analyst
UNIX Application Services R101
The MITRE Corporation
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