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Alternative Storage
Brief Description
Alternative storage is non high performance disk storage.
There are two forms of alternative storage:
- near line storage where data is stored on tape based silos (StorageTek)
- slower, less expensive storage called secondary storage (Clarion, EMC)
In either case alternative storage is the place where "overflow" storage from the data warehouse resides. Overflow storage contains:
- older data
- data that is not accessed frequently
- summarized data needed but not frequently accessed
- contingency data, and so forth
In order to make alternative storage operate properly, two pieces of software are needed:
- an activity monitor that determines how frequently data is accessed
- a cross media storage manager, that moves data to and from active storage and alternative storage
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