ESX 3.5i on HP DL320 G4: doesn’t work on RAID 0

This server is well known to as Cisco MCS 7825-H2 to us rather than the origin DL320 G4. I was working with this blade server today, was trying to install ESX3.5i on RAID 0, but unfortunately it’s not supported. I checked the HP site (http://h71028.www7.hp.com/enterprise/cache/524262-0-0-0-121.html) and got the proof, but surprisingly it works with RAID 1 (mirrored), but on the ESX Datastore it shows TWO (!!!) datastores! each with 74GB, 74GB+74GB=128GB in total! I couldn’t figure out how it could happen, it should show only 74GB in total if it is configured with RAID 1, right? I have no idea what is going on…