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The dual port is a separate feature from full-duplex.

Dual porting provides a redundant data path, which performs two functions:

1) Allows the drive to operate at 6GB/s instead of the regular 3GB/s (port combining for superior performance).

2) Allows the drive to continue functioning if and when one port becomes nonfunctional (eliminates single point of failure).

If dual porting were the feature that provided full duplex, neither of these functions would work, however all SAS serial interfaces are inherently full-duplex.

Note also that SATA does not support dual ports or full duplex, even on a controller that supports both SATA and SAS drives. You must use SAS drives to have these features.

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Q: What is the difference between a single port SAS drive and a dual port SAS dive?
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