Sunday, November 23, 2008

Working With VM Ware

By Mike White

Technology has a funny habit of solving one problem but then highlighting another. A typical example of this is the emergence of virtual operating systems, that is an OS that runs on top of another OS. While there are many advantages to many computer users in running these configurations they all rely the humble hard disk , and as fragmentation occurs, this can lead to instability and potentially data loss.

If you are fortunate enough to have very deep pockets then you may be using SSD's or solid state drives. These still remain expensive and are out of the reach of most users who still have to rely (although getting much faster) on the slowest and some would say the most vulnerable technology in your computer- the hard drive. Hard drive fragmentation can cause problems with virtual machines and in some cases even data loss.

Hard disk fragmentation occurs when files are split in to multiple chunks as they are slotted into spare space on the hard drive. If you are running a solitary OS chances are you have already noticed considerable slow down in your system since purchase. Just imagine two or more OS's running causing the same file fragmentation! Pretty soon your system could come to a grinding halt.

Fragmentation is the scourge of modern computers as most people fail to conduct even the most basic maintenance on their computers. The situation just get worse over time and some people have even been known to purchase a new system even though there is nothing wrong with the old. On servers and raid arrays fragmentation is far more serious as it slows down business applications and reduces productivity. In very bad instances data recovery is the only method of saving the data.

Each operating system will have it's own method of dealing with file fragmentation (or not as the case may be). Whilst Mac OS X will automatically defragment a file under the size of 20mb, windows pays scant regard to how badly files are fragmented. Other systems use a variety of different methods to combat the problem.

Utilizing defragmentation tools can help to alleviate the problem but often the use of some of these tools is very invasive and will render your system virtually unusable while they are running so what other options do you have.

Fortunately we are not left to the operating systems alone as there are a number of third party defragmentation applications that are far superior to the inbuilt OS tools. These can be scheduled to run when system usage is very low for example whilst the system is idle or the screen saver is running. As you go defragmentation is my personal choice.

Invest in dedicated hardware. Not the cheapest solution but for business and power user home systems probably the most sensible route. Dedicated hardware could be an additional hard drive (internal or external) a dedicated raid array or even an SSD device. The actual solution will depend on how mission critical the application actually is. - 15634

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