Striping allows you to simply
spread I/O across multiple disks, without incurring the planning and administrative
overhead of dealing with many individual disk drives.
The decision about how many disks should be in each array is often the topic of
intense debate. At one extreme, using multiple disks without grouping any of them
into arrays provides the most control and flexibility because every disk is visible and
can be targeted in isolation by placing certain files on each disk. However, this
approach requires more planning and can result in more ongoing administration,
because you will have to deal with every individual disk drive. As databases become
larger and larger, this approach can become unmanageable.
At the other extreme, youcan group all disks into one single array, seen by the
operating system and Oracle as a single ???disk.??? This makes for extremely simple
planning and administration; no effort is required to analyze where you should place
the various files, as there is only one ???disk.??? However, this approach sacrifices flexibility
and leads to brute-force solutions to I/O bottlenecks.
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