On Mon, Jul 14, 2008 at 8:13 PM, Joel Miller <[EMAIL PROTECTED]> wrote:
> Just to be clear... > > Each controller connects to each "side" of the back-end via a 2x wide SAS > port. > So each 2x wide port has 6 Gb/s bandwidth. > > One side goes into a SAS expander on the same controller and one side goes > through the SAS expander on the other controller (assuming an array with 2 > controllers). > > Each drive in the controller tray is connected to each of the SAS expanders > via a single SAS lane, and the expansion ports on each controller is 4x wide > and connected to that controllers' SAS expander. > > So theoretically, there is more bandwidth on a 25xx back-end than on a > 6140. Hmmm... both the 2500 and 6140 units share a PCI-X 133Mhz 64bit path between the XOR processor and I/O subsystem, which would limit the controller to around 1GB/s of data movement sequentially and around 44000 IOPs (4K random) on a 6140. >From that perspective... they are almost the same ;) Wonder if a PCI-e version would see the light of day as an "upgrade" model...
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