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> 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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