Ok so we have a coraid setup with 14 drives 1 spare. We used Raid5 and have a total of about 3.5TB of usable space. The majority of the disk access is writes (for now we went with raid5 because in time it will be mostly reads). The disk is slow to respond with a simply 'ls' at times. Its doing about 12MegaByes/sec writes when it lags.

The link is 1000Mb/sec

I have aoe going over eth1 and regular net traffic is on eth0.

Any advice guys?  Could it just be the sheer bottle necking of raid5 and the amount of writes? Or should I be looing at something else.