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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.
From: veritas-bu-bounces AT mailman.eng.auburn DOT edu [veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of Bryan Bahnmiller [bbahnmiller AT dtcc DOT com]
Sent: Thursday, February 10, 2011 09:58
To: Ed Wilts; Rusty.Major AT sungard DOT 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 <ewilts AT ewilts DOT org>
Sent by: veritas-bu-bounces AT mailman.eng.auburn DOT edu
02/09/2011 10:01 PM
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Rusty.Major AT sungard DOT com |
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NetBackup Mailing List <veritas-bu AT mailman.eng.auburn DOT edu>
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Re: [Veritas-bu] Backup Archive and Restore taking forever on DR server |
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On Wed, Feb 9, 2011 at 6:10 PM, <Rusty.Major AT sungard DOT 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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