But tiered storage alone does not ILM make. Even the most intelligent storage array just sees your data as bits stored in blocks. The most you can manage at block level is the kind of automated data migration that 3Par and Compellent do--moving data blocks from high-cost, high-performance drives to lower-cost drives based on block-access frequency. Although this can have some impact on the raw cost of storing your data, it doesn't have any real effect on backup and restore times because these functions are performed on a volume, file or database level.
What's It Worth To You?
The second half of the equation is knowing the business value of any piece of data. The majority of information reaches the end of its useful life after a finite period. Deleting data as soon as possible eliminates the possibility of exposure and minimizes expensive searches.
However, some files--archives of advertising materials and annual reports, for example--have value for an extended period of time beyond normal business processes. Data in a permanent archive need not--and often should not--be easily accessible by users. Leave a metadata bread-crumb trail so an archivist can determine what needs to be retrieved from offline storage.
Determining retention periods is relatively easy for structured data. Your DBAs should know what each database is for and how it impacts your business.
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