3gbps Vs 6gbps

Caporegime
Joined
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Is the specified speed per port or controller?

If the latter does that mean 375MB/s would be the maximum combined throughput of all drives connected to the controller?

Interested in this because of parity check speed would potentially be impacted
 
Associate
Joined
10 Apr 2008
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1,010
There are bottlenecks all over the place. A single port might be able to achieve 6gbps, but the PCIe lanes its using also have a max transfer rate. Add up all the ports and it'll likely be higher than the pcie lanes its attached to. If parity is done in hardware rather than a software driver, then the parity doesn't need to leave the controller chip, meaning the PCIe lanes are less of an issue, but you'll find the chip implementing RAID has its own bottleneck which impacts the speed. You can rarely achieve the theoretical max bandwidth in real life.
 
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