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Max transfer rates with raid controller

  • NAS / RAID
  • Controller
  • PCI Express
  • Storage
Last response: in Storage
November 17, 2010 12:11:12 PM

First of all, I'm no expert in this.

I'm trying to figure out which controller I should buy to make a raid 0 with four C300, to make sure that I wont hit a controller cap, if the discs can run even faster.

As I have been told the interface times 250 gives the maximal transfer rate, e.g. PCI-Express x4 would give 4*250Mb/s=1000Mb/s. But does this mean that PCI-Express 2.0 would equal a transfer rate of 2*4*250Mb/s=2000Mb/s?

If I'm missing something here please let me know.

More about : max transfer rates raid controller

a c 324 G Storage
December 22, 2010 3:01:58 PM

Are there two questions here? One is a good controller to use; the other is how many PCI-E lanes that controller should have?

You can go from the simple and inexpensive (some motherboards will do Raid0 using the CPU) to the fabulously expensive, such as this:

for about $1,215 plus tax. What processor / motherboard / os are you using? Are you planning to boot from this fragile Raid0 monster, or use it for data? How good are your backup plans?
a c 127 G Storage
December 22, 2010 10:19:12 PM

Onboard RAID0 with Intel chipset RAID works better than most cheap add-on controllers (FakeRAID).

PCI-express 1.0 = 250MB/s per lane
PCI-express 2.0 = 500MB/s per lane
PCI-express 3.0 = 1000MB/s per lane

So PCI-express 2.0 x4 would have the same bandwidth as PCI-express 1.0 x8; 4GB/s. Note that this bandwidth is full-duplex; meaning 4GB/s in and 4GB/s out; 8GB/s total.