- RAID -- disk fault tolerance only
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- Storage System Fault Tolerance -- disk ,controller and enclosure
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- Limited scalability -- offline forklift upgrades
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- Scalable across enclosures -- always online
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- Manual – Multi-click file level management
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- Autonomic – 1-Click block level management
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- Purpose-built hardware -- no economies of scale
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- Standard PC hardware – affordable redundancy
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