the RSTe stack is for enterprise solution..
it's just a BASIC RAID function for enterprise.....
something enterprise features:
Data protection
— Write through cache
— Bad block management
— Write journaling
— Read Patrol

System Management Flexibility
— Disk coercion
— RAID level migration
— Online capacity expansion
— Rebuild on hot insert

but it does provide the write-back caching function...
AND it's a s/w RAID.................