We have already mentioned that the hardware that makes up your system can influence the performance of your system. As an example of the influence of hardware's on performance, we will consider some of the implications associated with disk storage.
How you manage disk storage affects performance in four ways:
How you divide a limited amount of storage between indexes and data, among table spaces, and among buffer pools, determines to a large degree how each will perform in different situations.
Wasted storage in itself may not affect the performance of the system that is using it, but it may represent a resource that could be used to improve performance elsewhere.
How well you balance the demand for disk I/O across several disk storage devices, and controllers can affect how fast the database manager can retrieve information from disks.
Reaching the limit of available storage can degrade overall performance.