StorageTek 2540 and 2501 performance

I'm doing some work with a dual controller 2540 with 2501 expansion trays attached and would like to identify what the maximum throughput of the arrays should be.
This is how I understand the architecture:
Each 4Gbit FC host port can be active concurrently providing up to 400MB/sec per port, total of 1600MB/sec between the hosts and the array.
Each controller has a PCI-X bus between the host board interface and the SAS I/O controller, capable of 1GB/sec per controller.
The "SAS I/O controller" in each controller connects to it's local "SAS Expander" using a 2x wide SAS channel = 6Gbit/sec, and also connects to the other controller's SAS expander using (another?) 2x wide SAS channel.
The SAS expander in each controller has a separate single lane, 3Gbit connection to each of the 12 internal disks.
Each disk has a connection to the two SAS expanders, but only one is active (?). Total connection per disk to the rest of the array is 3Gbit?
There is a 4x wide connector from each SAS expander to the SAS drive port (to connect to a 2501). This has a throughput of 12Gbit/sec?
If the above is correct (and please feel free to put me right if I've got something wrong!), what happens in the 2501? From reading the documentation on the 2501, it would appear that the connection between the 2501 and the 2540 is 3Gbit (per controller). Is this a significant bottleneck if two 2501 expansion trays are added?
I got most of the above from http://shop.tisource.ch/pdf.php?id=1619793 and trying to match it with jmiller's comment in https://opensolaris.org/jive/thread.jspa?messageID=258953
Any insights appreciated.
Thanks
JR

The same result here for a 2540 attached to a Sun M4000 (with qlogic-hbas) running latest Solaris 10 8/07 with latest Patches. There is an 3510 attached also. The mpxio-device for the luns of the 3510 are working well.
The command "mpathadm-command show mpath-support libmpscsi_vhci.so" shows that the 2540-array (LCSM100_F) is supported. Nevertheless the mpxio-devices for the 2540 are not shown up.
I will making a sun-call now.
Christian

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