Configuration Guide
Page 50
...database with a high read rate, such as a supermarket, to great advantage without the second SP and battery backup unit required for storage-system caching. A RAID 5 Group also works well with a single-task ...RAID 3 Group (parallel access array) works well with transaction processing applications, such as a database repository or a database server that uses a normal or low percentage of write operations (writes are 33 percent or less of all I/O operations). You... resides on the RAID 5 Group. 2-20 EMC CLARiiON CX300, CX500, CX500i, and CX700 Storage Systems Configuration Planning Guide
...database with a high read rate, such as a supermarket, to great advantage without the second SP and battery backup unit required for storage-system caching. A RAID 5 Group also works well with a single-task ...RAID 3 Group (parallel access array) works well with transaction processing applications, such as a database repository or a database server that uses a normal or low percentage of write operations (writes are 33 percent or less of all I/O operations). You... resides on the RAID 5 Group. 2-20 EMC CLARiiON CX300, CX500, CX500i, and CX700 Storage Systems Configuration Planning Guide