Originally Posted by RulerOf
Welcome to fakeraid 5
Write speeds are abysmal with raid 5 under software. Depending on how much ram you have, you can generally transfer anything under a certain size very very quickly, and after that you deal with huge file transfer times.
It's actually kinda funny to drag and drop copy a 1 gig file and windows will say it finished in 5 seconds... but you can watch your HD's write for another 60.
If you want some redundancy though, do like another poster said and go 0+1 (or 1+0?) and you'll get good throughput to the drives. It sucks to feel 1T short of what you oughtta have, but losing 2T is not
I don't remember which one NOT to use w/ on-board, but either 0+1 or 10 (one of em) performs very poorly with onboard. The issue is, with fakeraid, anything with striping has a good chance to get lost when any 1 drive goes down. It may promise redundancy, but some on board controllers can't handle a drive going dead, and you lose everything even though you thought you had redundancy.
If you want redundancy w/ on board, use only RAID 1. RAID 1 is very tolerant, if one drive goes out, you just disable RAID, and use the good drive as-is.