Storage Management Strategies for the CIOThis time-honored mainframe technology (see "
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Rich Castagna, Editorial Director
When disk wasn't cheap") never caught on in the Windows and Unix worlds. But changes in technology suggest you should take another look at HSM. And if you're thinking of implementing HSM, consider how to integrate HSM into your open systems environments.
A solution in search of a problem? Several factors have combined to limit the adoption of HSM in open systems, notably:
- Dramatically falling prices for disk storage
- Distributed nature of open systems environments
- Fundamental characteristics of open system apps
This practice resulted in an increase in overall capacity, while utilization rates fell. Although this was wasteful, as long as the emphasis was on the cost of acquisition rather than the cost of management, it seemed reasonable. However, as administrative costs have begun to outstrip hardware costs, IT managers have renewed their interest in any option that can mitigate these costs.
The decentralized nature of open systems also discouraged the adoption of HSM. In the days of non-centralized, direct-attached storage (DAS), the opportunity to reallocate excess storage didn't exist. It wasn't worth the effort to recoup space from a particular system because there wasn't a way to effectively reassign it. With the onset of storage networks, reallocating storage has become more practical, so this objection no longer applies in many environments.
Nor does the issue of open systems' more interactive (vs. mainframe's) character. Open-systems applications tend to be highly interactive, whereas mainframes--to a large extent--perform huge quantities of batch processing. And the interactive nature of open-systems apps doesn't work well with HSM. If you directly applied the mainframe approach to open systems, when users attempted to access a document, for example, they'd be faced with an hourglass icon for several minutes. The potential increase in help desk calls alone is enough to discourage adoption of HSM. That problem is particularly apparent when tape is the target media for HSM data.
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This was first published in May 2003
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