Dell PERC 4/DC - Manual (Page 68)

Optimizing Data Storage
Data Access Requirements
Each type of data stored in the disk subsystem has a different frequency of read and write activity. If you know the data access requirements, you can more
successfully determine a strategy for optimizing the disk subsystem capacity, availability, and performance. For example, servers that support Video on
Demand typically read the data often, but write data infrequently. Both the read and write operations tend to be long. Data stored on a general-purpose file
server involves relatively short read and write operations with relatively small files.
Array Considerations
You must identify the purpose of the data to be stored in the disk subsystem before you can confidently select a RAID level and a RAID configuration. Will this
array increase the system storage capacity for general-purpose file and print servers? Does this array support any software system that must be available 24
hours per day? Will the information stored in this array contains large audio or video files that must be available on demand? Will this array contain data from
an imaging system?
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