- Fault-Tolerance – replicated dual-controller nodes
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- Fault Tolerance – multiple single-controller nodes
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- Volumes scalable within enclosure only
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- Multi-enclosure scalable volumes – always online
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- 50% protection penalty – 50% usable space
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- 50% or less penalty – up to 90% usable space
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- Automation – multi-click functions
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- Almost autonomic – many single-click functions
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- Purpose-built hardware with custom parts
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- Standard PC hardware – affordable redundancy
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