Measuring SHR/RAID read/write speed & performance

[C-Fu]

How would you go about doing this? Just wanna see what's the maximum write speed that I can achieve so I can upgrade my network infrastructure accordingly 

 

Example:

If my 13 disk SHR can achieve 400MB/s write speed, then I'll attach a quad gigabit or a 10G mellanox PCI-e card to it, with LACP-capable hardware and all.

 

Preferably a tool that won't destroy existing data in the SHR.