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There are some disadvantages in implementing RAID in software. First of all the problem is with portability. Since a software implementation will definitely have Operating System specific components, these components should have to be rewritten for each Operating System to be functional. The second major problem is that it uses kernel mode software developers. Unlike many other applications, the ability to execute instructions and evaluate the contents of any virtual address without any safeguards gives some programming errors.
This can lead to crash in the system. System processors have to be very aggressive. Servers are networked to provide services to the clients. Due to this reason the effect of network traffic on servers is of great significance. Network interface cards can be used for transferring data to and from physical memory. In fact, they consume a large amount of CPU time.
The applications which are driving files and servers have a very less impact on the CPU, application servers has very severe impact on CPU. To understand we have to look at the application servers. Generally application servers are the back-end of business applications that satisfy the following requirements - high-availability, high-performance and redundancy. Consider an application server that has relational database. Anyone who is familiar with relational databases is generally aware of the expense of performing many of the standard operations. Operations such as inner joins in mathematical terms have an order of O-mn. where m and n are the size of the record sets.
There are several advantages of implementing RAID in hardware. Firstly, we look at the embedded processors this is a heart of hardware RAID. Though embedded processors are engineered to be application-side. Is hardware RAID more good than software RAID? The answer is defiantly yes. It is portable operating system when compared to the Software RAID the server can continue to operate and even inform the user of the malfunction. If the server fails due to some undesired event, hardware RAID offers better availability compared to software RAID. Hardware RAID solutions are powered by battery backup that allow to maintain the coherency of their caches. Finally, one of the greatest advantages offered by hardware RAID is that the arena of embedded development is centered on the specialization for a target application.
These tests are being conducted to illustrate the superiority of hardware RAID to software RAID and the use of a mid-range controller for hardware RAID which is sufficient for the purpose of general application. The use a high-end hardware RAID controller can be expected to be superior at the higher-end. Thus from the above discussion, we can finally conclude that the hardware RAID is far more better than the Software RAID, thus we can say that the Hardware RAID is not only used for better performance of the application, but it can far good when compared to the Software RAID.
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