How to configure the IBM storage subsystem to achieve the best performance and availability possible

• Designate a hot spare disk drive in each expansion drawer.
• Create a RAID 10 array across as many disk drives as possible
• Create a logical drive that is two-thirds the capacity of the RAID 10 array
• Set the stripe size to 512 KB for each logical drive. The 512 KB stripe size provided
  the best results in IBM testing using the ORION utility
• Change cache settings on the logical drive
• Disable dynamic cache read prefetch.
• Map the logical drive to the host system

If you are considering or implementing an Enhanced Remote Mirroring solution, segment the data structure to the smallest size necessary. Small segments limit the amount of data to be transferred across the WAN links