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DNS response time for RAC nodes [message #496072]

Thu, 24 February 2011 04:09

behi
Messages: 12
Registered: June 2009

Junior Member

Hi,

I'm trying to install 2 nodes oracle RAC 11gR2 on SLES11. I configured DNS for public,virtual, private and scan IPs. when I check with nslookup, everything seems ok. but when I run runcluvfy.sh, it says that:
" PRVF-5636 : The DNS response time for an unreachable node exceeded 15000 ms on following nodes: rac1,rac2"

How can I decrease the response time?
many thanks in advance

behnaz

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Re: DNS response time for RAC nodes [message #496097 is a reply to message #496072]

Thu, 24 February 2011 07:50

knight
Messages: 111
Registered: January 2009

Senior Member

did you check with your network administrator

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Re: DNS response time for RAC nodes [message #496104 is a reply to message #496097]

Thu, 24 February 2011 08:36

behi
Messages: 12
Registered: June 2009

Junior Member

Unfortunately I don't access any network administrator! but when I ping nodes, it seems ok and runcluvfy confirms content of /etc/resolve.conf.
I googled the Internet about DNS config for Oracle RAC for finding the problem but I found no result!

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Re: DNS response time for RAC nodes [message #496185 is a reply to message #496072]

Fri, 25 February 2011 02:29

John Watson
Messages: 8976
Registered: January 2010
Location: Global Village

Senior Member

Might not be relevant, but make sure that your /etc/nsswitch.conf files are set to use DNS and disable /etc/hosts. I'm wondering if ping is fast because it is using hosts, and in fact your DNS isn't configured correctly.

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Re: DNS response time for RAC nodes [message #549742 is a reply to message #496185]

Tue, 03 April 2012 07:18

parisstc
Messages: 1
Registered: April 2012

Junior Member

Hello

if you are using a local/custom DNS try to edit your /etc/named.conf and
change
zone "." in {
type hint;
file "root.hint";
};

to

zone "." in {
type hint;
file "/dev/null";
};

This will make your DNS reply within the timelimit

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