HP LH4r Installation and configuration of the HP NetRAID, NetRAID-1 and NetRAI - Page 41

Chapter 4 Planning Step B. Plan Arrays and Logical Drives There are two ways to set up arrays and logical drives. • Automatic configuration is explained for those users who do not want to customize their arrays and logical drives. • Custom configurations permit you to create exactly the configuration that best suits your needs. Automatic Configuration Automatic mode defines the arrays and logical drives for you, and sets their parameters. It makes configuration easy. Automatic mode uses the following rules to define arrays: • It scans the physical drives, starting at SCSI ID 0 on Channel 0, and it groups the physical drives by capacity, with up to five drives in an array. • Each array is defined as a single logical drive, and array spanning is not used. • For each array, the system looks to see if you have asked to implement redundancy (checked the Redundancy box). If you are not using redundancy, all logical drives are assigned RAID level 0. • If an array contains two drives, and you checked Redundancy, the logical drive is assigned RAID level 1. • If a group contains three to five drives, and you checked Redundancy, the logical drive is assigned RAID level 5. • If an array contains only one drive, the logical drive is assigned RAID level 0. (No redundancy is possible on a logical drive containing just one physical drive.) • Automatic configuration does not create hot spares. You must create your hot spares before you begin automatic configuration. If Automatic configuration will suit your needs, you can proceed to Chapter 5, "Installation and Configuration." However, you are encouraged to read the entire planning section to determine whether or not a custom configuration would better meet your needs. 33