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In the field of storage, you used to be able to simply buy enough hard drives to fill your space needs and you would end up with sufficient disks to fulfill your performance needs. Unfortunately with hard disks getting so large, this is no longer the case.
To make matters worse, when you start moving from Directly attached storage to a Storage Area Network (SAN), the problem is compounded. In a SAN environment you now have multiple servers competing for the same resources, whereas previously you had one server and it had its own set of hard disks. With direct attached storage, one server could not effect the disk performance of the other servers in the data center because the disks were physically separated.
When planning your storage infrastructure, there are really two main things you need to focus on: