If it's performance you're after get one of those fast flash drives. They're way faster than SCSI.
Would it be possible for these scsi dtives to support raid so in someway i can have backups of my data in case there is failure?
RAID was born with SCSI, so most definitely yes. But you can get this with SATA aswell. Note that the drives themselves don't need to "support RAID", but the controller.
However, RAID only provides redundacy. It is still well possible to lose data even if you use RAID. So, it's no replacement for backups.
