HP Surestore Disk Array FC60 HP SureStore E Disk Array 12H User's and Service - Page 103

Concepts and Management Managing the Disk Array Capacity Capacity Management Strategies The way you decide to configure your disk array capacity will be determined by your system needs and your disk array management strategy. Are you willing to sacrifice maximum protection against disk failure for increased capacity? Is performance an issue? Table 3 describes the steps you can take to achieve your primary goal in managing the disk array. The trade-offs associated with each strategy are also described. Table 3. Disk Array Management Strategy To optimize... You should... But be aware that... Capacity • Make sure all capacity is allocated to • Disabling Active Hot logical drives. Do not leave any capacity Spare to increase the unallocated. available capacity has the • Avoid using Active Hot Spare, thus freeing up more capacity for logical drives. disadvantage of reducing protection from multiple disk failures. Disk Array Performance • Leave some capacity unallocated for use • Leaving capacity as RAID 0/1 space. This maintains unallocated and enabling performance as your disk array begins to Active Hot Spare both reach its maximum storage capacity. reduce the amount of • Keep Active Hot Spare Enabled to maintain performance following a disk capacity available to the operating system. failure. Because performance suffers when the disk array is operating in critical or non-redundant mode, rebuilding quickly will maintain disk array performance. The array also uses the Active Hot Spare as RAID 0/1 space until needed. Data Redundancy • Leave Active Hot Spare and Auto Rebuild enabled. This offers the best protection from a disk failure. • Enabling Active Hot Spare decreases the amount of capacity available to the host. Concepts 103