PRVF-5636:DNS response time for unreachable node exceeded "15000" ms_1356975.1

rongshiyuan發表於2015-01-17
DNS

PRVF-5636 : The DNS response time for an unreachable node exceeded "15000" ms on following nodes (Doc ID 1356975.1)


In this Document

Purpose
Details
References

Applies to:

Oracle Database - Enterprise Edition - Version 11.2.0.1 and later
Information in this document applies to any platform.

Purpose

The note explains what to look for when experiencing the following error:

PRVF-5636 : The DNS response time for an unreachable node exceeded "15000" ms on following nodes: racnode1

 

Details

Cluster Verification (cluvfy or CVU) detects whether DNS is configured properly by looking up an unknown host and expecting the command to finish in less than 15 seconds.

$ nslookup unknown-not-reachable-node

Case 1: nslookup takes too long time

In below example, it takes over 18 seconds thus the error is generated:

$ time nslookup unknown-not-reachable-node
;; connection timed out; no servers could be reached
.
real    0m18.020s
user    0m0.001s
sys     0m0.005s


As nslookup is OS tool, please engage System/Network Administrator to find out why it takes so long and fix it.

One example on Linux:

grep options /etc/resolv.conf
options timeout:1
options attempts:2

 

References

BUG:11775332 - CLUVFY FAILS WITH PRVF-5636 WITH DNS RESPONSE TIMEOUT ERROR
NOTE:1480242.1 - PRVF-5637 : DNS response time could not be checked on following nodes
 

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PUBLISHED
Dec 5, 2014
Dec 5, 2014
     
 

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Oracle Database - Enterprise Edition
     
 

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