I then gave it a try to see if I can get some results from the mac-mini. It’s still really fast and I am glad to know the limit. Until we get some other Thunderbolt RAID devices in house it’s impossible to tell but at around 8Gbps, this is clearly an interface that has legs. I’m not entirely convinced that we’re limited by Thunderbolt here either - it could very well be the Pegasus’ internal controller that’s limiting performance. Note that this isn’t a shipping configuration, but it does show us the limits of the platform. With highly compressible data, I managed to get just over 1000MB/s (8021Mbps to be exact) to the 4-drive SF-2281 Pegasus R6. It’s also significantly faster than the eSATA connections available on many Windows PCs. Even with estimated real-world performance of around 8Gbps, Thunderbolt is many times faster than FireWire 800 and USB 3.0. Thunderbolt is also bi-directional, meaning it can transmit and receive data at the same time. A Thunderbolt channel can provide up to 10 Gigabits per second (Gbps) of data throughput-and each Thunderbolt port includes two channels. Gordon Ung at Maximum PC saw peak read transfer speeds of 931MB/s when reading from a RAID 0 of four 240GB SandForce SF-2281 SSDs in a Pegasus R4 chassis.ĪnandTech actually got an SSD RAID in a Pegasus chassis right up to 1002MB/s at its very peak, which seems to be right up at the practical limit of a single Thunderbolt channel, but that was using a RAID 0 of four 128GB 6Gbps SATA SSDs, running sustained 2MB reads at a queue depth of 10.ġ002MB/s is about the same as 8Gbits/s and here is more: So how much performance can you actually wring out of a Thunderbolt connection? Actual Bandwidth: PCI Express and Thunderbolt Promise Pegasus R6 & Mac Thunderbolt Review.
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