RAID levels comparison in Hiatchi VSP storage systems

	RAID‐10	RAID‐5	RAID‐6
Description	Data Striping +(plus) Mirroring	Data Striping with +(plus) distributed parity	Data Striping with two distributed parities
Disk count	4 (or) 8	4 (or) 8	8
Advantages	Highest performance with data redundancy; higher write IOPS per Parity Group than with similar RAID‐5.	The best balance of reliability, cost, and performance.	Balance of cost, with extreme emphasis on reliability
Disadvantages	Higher cost per number of physical disks	Performance penalty for high percentage of Random Writes	Performance penalty for all writes