Consider the following information to ensure adequate protection.
- Disk-unit level protection
If you have planned for disk-unit level protection, you do not need to do anything more. All mirrored disk pools have disk-unit level protection if they meet the requirements for starting mirrored protection.
Input/output bus level protection If you have planned for I/O bus level protection, you do not need to do anything more. All mirrored disk pools have I/O bus level protection if they meet the requirements for starting mirrored protection.
- Input/output adapter level protection
If your planned disk units do require an IOA, add as many IOAs as possible, keeping within the defined system limits. Then balance the disk units among them according to the standard system configuration rules.
- Input/output processor level protection
If you want IOP-level protection and do not already have the maximum number of IOPs on your system, add as many IOPs as possible, keeping within the defined system limits. Then balance the disk units among them according to the standard system configuration rules. You might need to add additional buses to attach more IOPs.
- Bus-level protection
If you want bus-level protection and already have a multiple-bus system, you do not need to do anything. If your system is configured according to standard configuration rules, the mirrored pairing function pairs storage units to provide bus-level protection for as many mirrored pairs as possible. If you have a single-bus system, you can add additional buses as a feature option.
- Expansion-unit level protection
If your system is configured with an equal number of equal capacity disk units between expansion units, the mirrored pairing function pairs the disk units in different expansion units to provide expansion-unit level protection on as many disk units as possible.
- Ring-level protection
If your system is configured with an equal number of equal capacity disk units between high-speed links (HSL), the mirrored pairing function pairs the disk units in different high-speed link (HSL) configurations to provide ring-level protection on as many disk units as possible.