Solaris, Windows, & Linux all do some variant of nscd - Name Services Caching
Daemon - if you haven't explicitly disabled it for some reason. AIX just added
it in OS version 6.1. AIX <= 5.3 and HPUX, as you say, you had to setup a
caching, fowarding DNS server local on the system to achieve equivalent
functionality.
------------------
Jim VandeVegt | Technical Integrator, ETG
Physicians Mutual | 2600 Dodge Street | Omaha, NE 68131
402.930.2649 | PhysiciansMutual.com<http://www.physiciansmutual.com/> |
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________________________________
From: veritas-bu-boun...@mailman.eng.auburn.edu
[veritas-bu-boun...@mailman.eng.auburn.edu] On Behalf Of Bryan Bahnmiller
[bbahnmil...@dtcc.com]
Sent: Thursday, February 10, 2011 09:58
To: Ed Wilts; rusty.ma...@sungard.com; NetBackup Mailing List
Subject: Re: [Veritas-bu] Backup Archive and Restore taking forever on DR server
Ed, Rusty,
Have you noticed if the load on the DNS servers has gone down? I remember
building an HPUX master server with thousands of clients. Our master server
hammered the DNS server. We ended up configuring a DNS caching server on our
own master. It didn't add a lot to the load on the master, and it severely
reduced the network traffic to the DNS server and almost eliminated the load on
the DNS server.
I haven't run with 7.x yet and since we are in process of building out a 7.x
Linux master server I was kind of curious to see if this was still an issue
with 7.
Thanks,
Bryan
Ed Wilts <ewi...@ewilts.org>
Sent by: veritas-bu-boun...@mailman.eng.auburn.edu
02/09/2011 10:01 PM
To
rusty.ma...@sungard.com
cc
NetBackup Mailing List <veritas-bu@mailman.eng.auburn.edu>
Subject
Re: [Veritas-bu] Backup Archive and Restore taking forever on DR
server
On Wed, Feb 9, 2011 at 6:10 PM,
<rusty.ma...@sungard.com<mailto:rusty.ma...@sungard.com>> wrote:
If this is version 7.0.1, there is a hostname caching 'feature' now in
NetBackup (Which I do NOT like, Symantec!!!). It caches the IP for each host
configured in NBU and sometimes this can result in the incorrect IP being tied
to the hostname. The default TTL for this cached data is one hour, but you can
refresh it by running the following command on the Master/Media server(s)
and/or clients:
bpclntcmd -clear_host_cache
So, you could see that even though the name resolution may be fixed in DNS or
hosts, NBU may still have it cached. I've heard there's a way to reduce the
time this is refreshed, but I don't remember where it's at.
The DNS caching behavior is controlled by the 2nd parameter of the
master server's VNET_OPTIONS in bp.conf; units are in seconds. The
default in 7.0.1 is 1 hour, but we've reduced this to 5 min in our
environment without ill effect:
VNET_OPTIONS = 120 300 200 40 3 1 30 5 1793 32 0 0
.../Ed
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