Oracle VM Review

We are able to build large hosts using Oracle Virtual Cloud Appliance. ​I’d like to see an improvement in read latency and write bandwidth to meet or exceed VMware's performance.

Valuable Features

When deploying the Oracle database, you can license only the processors used for the database rather than all the processors on the box, as with VMWare. Plus, it’s free.

Improvements to My Organization

We are able to build large hosts (using Oracle Virtual Cloud Appliance, for example) and wait to license CPUs for our databases until we need them. That translates into more money up front for servers and salespeople.

Room for Improvement

I’d like to see an improvement in read latency and write bandwidth to meet or exceed VMware's performance, and also smooth out the variance in both. People are choosing VMware over OVM left and right despite the licensing issues. OVM needs to be faster than anyone else, especially with Oracle’s own products.

Use of Solution

I've been using it for three years.

Deployment Issues

It’s a bit clunkier to deploy and manage than other systems, e.g. VMware.

Stability Issues

We have had no stability issues.

Scalability Issues

Scalability has not been an issues.

Customer Service and Technical Support

Oracle is very good at supporting engineered systems, so if you’re using OVM on a PCA, you get good service. Otherwise, it’s pretty typical tier-one/tier-two tech support.

Previous Solutions

I have used VMware, Hyper-V, and AIX LPARs. I chose Oracle VM (when using x86) not only because it’s free, but because of the Oracle DB licensing benefits. Hyper-V is not really all there yet. VMware is awesome, but the Oracle licensing is a crippling problem.

Initial Setup

I would say it’s less straightforward than you’d expect. I haven’t installed it recently, but my impression was that it was about 70% ready for prime-time. Once you have it installed and sorted out, it runs pretty smoothly. Getting it there is another issue entirely.

Implementation Team

We mostly use a vendor to set up OVM, but occasionally we will do it in-house as well. My main advice is to practice it first, read all documentation, look at MOS documents, and review all blogs and community discussions you can find.


For our specific ROI, OVM allows us to buy larger systems to accommodate projected growth but not go broke on licensing. We can get new licenses on demand when we have a reason to buy them rather than all up front and hoping we expand into it. That means we can concentrate on selling new opportunities and buying the licenses after the sales are locked in. We don’t have money sitting out there idling.

Pricing, Setup Cost and Licensing

The biggest benefit is being able to license Oracle products (especially the DB) based on the number of CPUs actually used rather than all the CPUs on the box as you have to do with VMware. This results in a lot more flexibility in the sizes of servers you can buy and how you plan for future growth. If you had to buy all Oracle licenses for every CPU, you might get a smaller server to start with and that doesn’t really help with expansion.

Properly sizing your equipment for growth often means buying equipment much larger than you need right away. The money you save with Oracle VM by not buying extra licenses means you can focus on preparing your hardware for the future rather than having to balance between licenses, hardware, and practicality.

Before speccing out your systems, it’s best to start figuring out how many CPUs you need now and in the future, then you’ll be able to decide what server/VM solution you need. If you’re looking at a small software footprint now, but in one to two years you expect to double or triple your transactions, you’ll definitely want to start with a big server and OVM to reduce software licensing costs.

Other Advice

My main advice is not to do your first install when sitting at the client building a production system. Practice it beforehand and make sure you work the bugs out. Once you install it the first time, it’ll be far easier to breeze through it on subsequent installs.

Disclosure: My company has a business relationship with this vendor other than being a customer: We are an Oracle Platinum business partner.
1 Comment
Robin Saikat ChatterjeeConsultant

There is a great comparison of Vmware vs physical vs OVM by flashdba. Remember that he used all flash storage hence real world values will have smaller variance as disk itself will introduce latencies that are similar for all.. having said that the difference between OVM and Vmware is not very high 1133 mbps vs 1052 mbps where as physical was 1519 mbps. given that the realworld values would be affected by the type of storage array and storage connectivity I think if you are choosing virtualization you have already compromised on your I/O.

04 July 16
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