How to measure complexity availability operation & Maintenance costs etc.

Dear all

We have several configurations to achieve high availability, maximum availability with and/or in data for data centers. Some use Active - Solution of Clustering Active while some use Active - Passive Solution. Some use only BONE clusters like Sun Clusters, Veritas clusters. Often that I noticed, a combination of cluster OS say Veritas Cluster Cluster Oracle (Clusterware + RAC) and database solutions.

In these situations how it is with a Quantitative analysis of each method? What are the inputs, we'd need and how these calculations happen? In searching the Internet, I saw earlier ACTIVE - clusters in ACTIVE database using FCR and Oracle Clusters RAC availability is some 99.xx% while other approaches are noted accordingly. How we are to these quantitative decisions? Could you please advice.

I was asked to come up with these numbers of sub elements mentioned for a few approaches that I suggested.

Availability of the database
Complexity of the Architecture and understanding.
Set up costs.
Operating costs.
Maintenance costs

For your understanding, I suggested below approaches to achieve high availability with Production data center.

Approach - I: I Active - Passive database running on the node a and b respectively. Db1 will be active on the node and DB2 will be active on the node b. If that fails, they switch to the alternative.

Approach - I: I Active - Passive database running on the node a and b respectively. DB1 and DB2 will be active on node a and node b is still running waiting for a failover event. If that fails, they switch to node b.

Approach - III: I DB1 and DB2 active on the node. We can configure Dataguard (logic or secondary Physics) on node b in the center of production data.

Approach IV: I have a two-node cluster running CARS and will be ACTIVE-ACTIVE database DB1 and DB2 running on them.

Personally, I like the approach IV. However, for commercial reasons, we must make a decision based on the quantitative analysis.

If any of you have already done such an exercise, could you please share yoru experiences here?

Thank you very much for all your advice in this sense.

Kind regards!
Sarat

An excellent question, but impossible to estimate because everything depends on your site combinations, experience, budget and hardware/software. Luck is also important. If you hit an unexpected bug you can throw your forecast of availability by the window.

Companies like Gartner may have intercourse "industry average", based on real data that you can buy, otherwise you really need to implement the solution, best practices research and see if you can improve the availability you learn.

First of all, you will have to work what is the cost of downtime? For example, if a stock market is declining, it costs billions of dollars. If a HR system does not work, no one cares until payroll. Why build a cluster active / expensive asset if you do not need?

Then you must standardize hardware and an operating system. How scalable do you need it? Are your applications written to the scale on the CARS, or will they run better on spot?

Next, you need to compare each solution for single-point-of-failure, develop the component failure rate and the cost to remove this point of failure. Good luck to find the failure rates of the component of your servers, network cards, hard drives, etc.

Guess the clusters do not have greater availability. Improperly applied RAC clusters can have much more limited availability to single instance well implemented.

Tags: Database

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