On Sept 21, 2011, Saar Moaoz from Oracle RAC Pack Team and I co-
presented an IOUG Virtualization online education session:
“Virtualizing Oracle 11g/R2 RAC Database on Oracle VM: Methods/Tips.”
This presentation was based on Oracle VM 3.0 technology, which was
released a few weeks before this presentation. After the presentation,
we have recieved a few questions about Oracle VM and RAC. Both of Saar
and I provided the answers for these questions. IOUG has posted the
QAs and the actual presentation video recording on IOUG IOUG Webinar
Archieve. I copied some of these quesions and answers as follow. For
more details and the actual presentation recording, please visit this link. You also can download the presentation pdf here.
Copy of the some Questions and Answers:
Q: Is there any written tutorials/white papers on how to setup a RAC
on an Oracle VM?
A: To use the RAC OVM Templates, http://www.oracle.com/technetwork/database/clustering/overview/rac-template-11grel2-166623.html. For whitepaper on RAC/OVM: http://www.oracle.com/technetwork/database/clustering/oracle-rac-in-oracle-vm-environment-131948.pdfFor RAC support on Vmware, it is supported, just not certified, see My
Oracle Support Note: https://support.oracle.com/CSP/main/article?cmd=show&type=NOT&id=249212.1
Q: Is it supported to increase the size of System.img file (plenty of
approaches is available in the internet), since it is based on block
device and not LVM, which could eliminate this problem?
A: Yes, the templates are a starting point, you are welcome to tune/
tailor them further to your environments.
Q: Why should in production support template shared disk be on a local
disk? How different node from multiple host can access them?
A: Test deployment allows a special case, where the DB files are on
localdisks, in that case all VMs forming the cluster must run on the
same Dom0/OVS server. For production, shared disks must be used and
accessible from all Dom0/OVS Servers. “lsinventory” output is available
inside the zip file of each template, no need to create a VM, simply
unzip and look at lsinventory output.
Q: Can RAC on VM use ASM instead of OCFS?
A: RAC inside the guests uses ASM, not OCFS2. On Dom0, for the
repository, OVM may use NFS or OCFS2, but this places only the
OS/Oracle VM files, not the database which is in ASM as said before.
Q: Will there be an OVM setup for RAC One Node?
A: The current RAC OVM Templates support RAC ONE NODE. Simply follow
note# 1232802.1. Create a service, then use the convert database
command. Note the troubleshooting section at bottom of that article.
Q: Does the template work when you deploy virtual images on different
physical boxes and club them as nodes in RAC implementation?
A: Yes, the templates work for production (where each VM is on different
Dom0),or for test (where some or all VMs may be on same dom0).
Q: Installation instruction for installing RAC11g2 under OVM3?. pdf files
are for ovm 2.
A: The basic steps are the same. Import the template w/Manager, create
the VMs, attach shared disks, adjust CPU/Memory. The only catch is to
remove the xenbr0/1 on the template and map it to the bridge names in
OVM3. We will have a reference document to highlight only these
differences in some time.
Q: Do I need to install OVM 3.0 before I start applying my VM
templates for RAC database?
A: Yes. You need to install Oracle VM servers and VM manager
and configure the virtual infrastructure before using VM template.
Q: I am not clear how to proceed if I have bare bone server
A: Here is an outline of the steps.
1. Install Oracle VM server,
2. Install Oracle VM manager
3. Configure shared storage and networks on VM servers
4. Download and import the VM templates including RAC VM
5. Create VMs using templates
6. configure the virtual networks and virtual storage on VMs
7. following the step given by Saar to configure RAC on the
VMs. The first part of the presentation covers the virtual
infrastructure configuration (step 1-6) .