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Oracle Database 11g Release 2 (11.2.0.3.0) RAC On

Oracle Linux 6.1 Using VirtualBox

This article describes the installation of Oracle Database 11g release 2 (11.2.0.3 64-bit) RAC

on Linux (Oracle Linux 6.1 64-bit) using VirtualBox (4.1.4) with no additional shared disk

devices.

 Introduction

 Download Software

 VirtualBox Installation

 Virtual Machine Setup

 Guest Operating System Installation

 Oracle Installation Prerequisites

 Install Guest Additions

 Create Shared Disks

 Clone the Virtual Machine

 Install the Grid Infrastructure

 Install the Database

 Check the Status of the RAC

Introduction

One of the biggest obstacles preventing people from setting up test RAC environments is the

requirement for shared storage. In a production environment, shared storage is often provided

by a SAN or high-end NAS device, but both of these options are very expensive when all you

want to do is get some experience installing and using RAC. A cheaper alternative is to use a

FireWire disk enclosure to allow two machines to access the same disk(s), but that still costs

money and requires two servers. A third option is to use virtualization to fake the shared

storage.

Using VirtualBox you can run multiple Virtual Machines (VMs) on a single server, allowing you

to run both RAC nodes on a single machine. In additon, it allows you to set up shared virtual

disks, overcoming the obstacle of expensive shared storage.

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 6.1

 VirtualBox (Must be version 4.1.2 or later)

 Oracle 11g Release 2 (11.2.0.3) Software (64 bit)

VirtualBox Installation

First, install the VirtualBox software. On RHEL and its clones you do this with the following

command as the root user.

  

Once complete, VirtualBox is started from the "Applications > System Tools > Oracle VM

VirtualBox" menu option.

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评论1

Jesusgone123

2012-11-27

很好，vbox是rac搭建目前看可行的，而且vbox配置很灵活

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