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High A vailability of OAS [message #388440] Tue, 24 February 2009 14:21 Go to next message
Messages: 235
Registered: December 2007
Location: USA
Senior Member
Hi Guru's

We are contemplating building a highly available environment for our Mgmt Information Portal that was developed using Oracle App Server. At this time App Server is running on two servers. A quad-processor server hosts the mid tier and a dual-processor server hosts the infrastructure. What kind of hardware configuration would you recommend for the highly available environment in terms of number of servers/processors? I need this info to determine the cost of additional software. Also, will we need RAC licenses to build this environment?

Please any advice is greatly appreciated.

Re: High A vailability of OAS [message #388442 is a reply to message #388440] Tue, 24 February 2009 14:40 Go to previous message
Mahesh Rajendran
Messages: 10694
Registered: March 2002
Location: oracleDocoVille
Senior Member
Account Moderator
>>recommend for the highly available environment in terms of number of servers/processors
Define "highly available environment" in your terms.
Adding more processors help nothing with availability.

RAC protects from a single node failure (database).
In RAC, the same database is mounted in many nodes.
If One node goes down, the rest will continue to serve.
If the database goes down, RAC is of no use.
That is why for a real high available environment you need dataguard or similar implementation.
That covers the database.

You still have the mid-tier and infrastructure nodes.
Infrastructure has its own small seed database.
You can have clustered infrastructure/middletier, if you can afford the $$$. Look into cold/active failover clusters depending on your need.
Look into loadbalancers/switches. Web cache / HTTP server clusters and hardware clusters are worth to have look into.

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