Re: 9iR2 RAC networks

From: K Gopalakrishnan <kaygopal_at_gmail.com>
Date: Tue, 3 May 2005 15:01:29 +0200
Message-ID: <3b0f44a1050503060114b655a6@mail.gmail.com>

David:

Not quite true. If the private interconnct fails (unless you have configured NIC failover for private intereconnect) there will be a node eviction.There are couple of underscore parameters to control the behavior and the time when it should be evicted. Typically Oracle Cluster Manager detects the failure and understands whether that is a network failure or node failure from the quorum device.

If there is a network failure, other node will be still writing in the quorum device, but it may not be able to ping. In this case the Cluster Manager will detect the failure and the node which owns the voting disk will survive (of course there are different algorithms used for split-brain resolution, and the above answer is quite over simplified)

Only in AIX, if one interconnect fails , the other network card is automatically selected (this is called as TNFF Transperent Network Failover Failback).

--=20

Best Regards,
K Gopalakrishnan=20
Co-Author: Oracle Wait Interface, Oracle Press 2004 http://www.amazon.com/exec/obidos/tg/detail/-/007222729X/
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http://www.freelists.org/webpage/oracle-l Received on Tue May 03 2005 - 09:06:21 CDT