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Disadvantages of Clustering

georgejk
Greenhorn

Joined: Jul 29, 2002
Posts: 24
Anybody can tell me what is the disadvantages of implementing clustered environment?
Chris Mathews
Ranch Hand

Joined: Jul 18, 2001
Posts: 2712
The two big disadvantages are:
1) COST!!! Clustering is usually not a very cheap solution both in terms of hardware costs and software costs. For example a standard copy of WebLogic costs 10K per CPU. A clusterable copy costs 20K per CPU. This effectively doubles your licensing costs for going with a clustered WebLogic solution. Most other vendors are the same.
2) Decreased Serviceability. A cluster is harder to manage than a single server. This obviously makes sense. The more nodes you throw into the cluster, the more work it is to administer the cluster. Many clustering implementations are making good headway into this area with Auto-Discovery and Cluster-wide Deployment capabilities.
[ September 18, 2002: Message edited by: Chris Mathews ]
Jim Baiter
Ranch Hand

Joined: Jan 05, 2001
Posts: 532
But the cost of scaling with a non-clustered approach can be much higher.
Tim Holloway
Saloon Keeper

Joined: Jun 25, 2001
Posts: 16092
    
  21

Overhead! Like multi-tasking, clustering adds a certain extra cost to each work unit. Which is balanced by the fact that you can perform work concurrently instead of serially.
The clustering equivalent to balancing the cost of overhead is the ability to schedule more efficiently between processors and the fact that loss of a processor will have minimal impact on the work.


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