rootvg and hardware raid1

Good Morning,

We have a JS22 blade that we will be loading AIX5.3 onto it. We just discovered that the JS22 will only support one drive, so we are planning on booting this blade from the Fiber Channel SAN. Orginally we used 2 physical drives and set up RAID 1 and presented the logical drive to the JS22. The consultant that is setting up the system told us that this would not work for rootvg and that in order for the system to work properly AIX needs to see both drives. I have limited knowledge of unix/linux, but i find it hard to believe that a hardware based raid solution would not work. Can anyone shed any light on this for me?

Thanks
G