One of the most difficult questions faced by organizations is how to actually de
ID: 3832370 • Letter: O
Question
One of the most difficult questions faced by organizations is how to actually deploy the system. Should it a direct cut over deployment be attempted? It is the cheapest and most direct? Should the two systems be run in parallel? And for how long? Is there a way to do a phased implementation?
Discussion of the issues and how does a company make a decision of which type of approach to take. Things that might be considered are:
Urgency of the new system in production
Experience and past performance of the development team
Complexity of the new system
Criticality of the new system (what is the cost of errors or failure?)
Explanation / Answer
Deployment of a new system is neede in two conditions.
Firstly, when the organisation want to install a new server. secondly, when it chooses to upgrade the server to latest version.
In these both cases, depends upon the availability of the reources organisation opts for direct cut over method or parallel method.
Direct cut over method:
In this method organisation wants to replace the server with the new one by deploying in a single day.
Advantages:
1. When the organisation in urgence of the new system. That is if it is a production systrem which has to be deployed in very short time, direct cut over method is the best one.
2. Down time of the server is very less which is helpful in business function.
3. The new server can be used immediately after the deployment
4. It is very cheap method.
Disadvantages:
1 It is more risky because it is not always that implementation of systems is successful. If there is any problem in the system then organization as a whole has to suffer.
2 It is very difficult to detect minor errors as due to absence of parallel system. Errors may be there because testing data is not as big as there may be live data.
3. Sometimes major errors can terminate the system so whole operation will be stopped and there will be difficulty of back up.
Parallel method:
It is the method in which existing system and new systems are made to run or work simultaneously or in parallel direction.
Advantages:
1. Parallel method can check even small errors in deploying as it is a comparision method with the existin and new one.
2. It is risk free in nature, if one system fails then another system comes in to picture and there will be no data loss.
3. It is a excellent way to test the live data.
Disadvantages:
1. This method is very expensive.
2. It is very expensive conversion strategy as two systems has to run at the same time so it is a great expense in terms of power and support.
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