You will have to prove that. I have previously posted posts with links to benchmarks that show that hardware raid with sufficient processing power beat the pants of software raid when it comes to raid5/6 implementations. Hardware raid cards no longer come with crappy i960 cpus.
Just by doing some quick googling, I came across:
http://blogs.zdnet.com/storage/?p=126 http://storagemojo.com/2007/04/24/mo-better-zfs-performance-stats/ http://milek.blogspot.com/2007/04/hw-raid-vs-zfs-software-raid-part-iii.html
I have an issue with that benchmark. I don't know what that EMC is made of nevermind the fancy FC.
Regarding my posts...they were on the ubuntu-user list...not here...so...here are the links:
Thread post: https://lists.ubuntu.com/archives/edubuntu-users/2008-December/004887.html
Don't use underpowered hardward raid boards for raid5/6 http://www.chemistry.wustl.edu/~gelb/castle_raid.html
Use hardware raid boards with enough cpu/cache for raid5/6 http://www.linux.com/feature/140734