FW: Extended RAC and multicast
- From: Iggy Fernandez <iggy_fernandez@xxxxxxxxxxx>
- To: "oracle-l@xxxxxxxxxxxxx" <oracle-l@xxxxxxxxxxxxx>
- Date: Mon, 14 Apr 2014 11:29:37 -0700
A friend asked me a question that I could not answer. He is in the planning
stages of an "extended RAC deployment" and is looking for confirmation that
multicasting is optional.
Help would be appreciated.
Kindest regards,
Iggy
-- Iggy FernandezEmail: iggy_fernandez@hotmail.comCellphone: (925) 478
3161Blog: So Many Manuals So Little Time
Author of Beginning Oracle Database 11g AdministrationEditor of the NoCOUG
JournalLecturer at University of Washington Professional and Continuing
Education
Date: Mon, 14 Apr 2014 11:13:03 -0700
From: kulkarniravi@xxxxxxxxx
Subject: Extended RAC and multicast
To: iggy_fernandez@xxxxxxxxxxx
I am looking to setup extended RAC for my client. The details are as following:
The two data centers are separated by a distance of less than 20 miles.
They are connected by a high speed dedicated connection.
Operating System: RHEL 6 64 bit
Database version: 11gR2 (11.2.0.3)
Hardware: Four servers with 4x16 configuration
All the documentation I have reviewed so far says multicast should be enabled
on the private interconnect between all the nodes
of a RAC database. However, my network resources tell me that multicasting is
not enabled across the data centers and VLANs
do not span across the data centers. The only reference I have seen to
multicasting requirement is in this Oracle document:
http://docs.oracle.com/cd/E16655_01/install.121/e17888/networks.htm#CWLIN476
Specifically it makes the following assertion:
"You do not need to enable multicast communications across routers"
Does this mean, multicast is optional?
Regards,
Ravi Kulkarni
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