We did a customer implementation for a Sharepointfarm 2010. Goal was to reach high throughput and High Availability over 3 datacenter.
This is the part IO Testing and Results that we get from 2xFusion IO Duo (640GB) with Softwarestripe Windows 2008R2 on a DL 580 G7 4x16Core AMD, 192 GB RAM
Detailed Information you will find on the attached Excelspreadsheet (SQLIO testresults) done with 64K stripe and 64k ClusterNTFS Size.
We get about 3GB Random Read and about 2,2 GB Random Write out of the System. Latency at this Level is less than 20ms with 256 outstanding IO's writing randomly with 4 threads into 4 files each 8 GB in size.