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Oracle Database 11g Release 2 (11.2.0.3) RAC On Oracle Linux 6.3 Using VirtualBox

This article describes the installation of Oracle Database 11g release 2 (11.2.0.3 64-bit) RAC on Linux (Oracle Linux 6.3 64-bit) using VirtualBox (4.2.6) with no

additional shared disk devices.

Introduction

Download Software

VirtualBox Installation

Before you launch into this installation, here are a few things to consider.

The finished system includes the host operating system, two guest operating systems, two sets of Oracle Grid Infrastructure (Clusterware + ASM) and two

Database instances all on a single server. As you can imagine, this requires a significant amount of disk space, CPU and memory.

Following on from the last point, the VMs will each need at least 3G of RAM, preferably 4G if you don't want the VMs to swap like crazy. As you can see,

11gR2 RAC requires much more memory than 11gR1 RAC. Don't assume you will be able to run this on a small PC or laptop. You won't.

This procedure provides a bare bones installation to get the RAC working. There is no redundancy in the Grid Infrastructure installation or the ASM

installation. To add this, simply create double the amount of shared disks and select the "Normal" redundancy option when it is offered. Of course, this will

take more disk space.

During the virtual disk creation, I always choose not to preallocate the disk space. This makes virtual disk access slower during the installation, but saves

on wasted disk space. The shared disks must have their space preallocated.

This is not, and should not be considered, a production-ready system. It's simply to allow you to get used to installing and using RAC.

The Single Client Access Name (SCAN) should be defined in the DNS or GNS and round-robin between one of 3 addresses, which are on the same

subnet as the public and virtual IPs. Prior to 11.2.0.2 it could be defined as a single IP address in the "/etc/hosts" file, which is wrong and will cause the

cluster verification to fail, but it allowed you to complete the install without the presence of a DNS. This does not seem to work for 11.2.0.2 onward.

The virtual machines can be limited to 2Gig of swap, which causes a prerequisite check failure, but doesn't prevent the installation working. If you want to

avoid this, define 3+Gig of swap.

This article uses the 64-bit versions of Oracle Linux and Oracle 11g Release 2.

When doing this installation on my server, I split the virtual disks on to different physical disks ("/u02", "/u03", "/u04"). This is not necessary, but makes

things run a bit faster.

Download Software

Download the following software.

Oracle Linux 6.3 (http://edelivery.oracle.com/linux)