HP LH4r Integrated HP NetRaid Controller Configuration Guide - Page 34

Chapter 4 Planning • 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. CAUTION For performance reasons, non-hot-swap devices should not be combined in arrays with hot-swap disk drives. If your nonhot-swap devices have the same capacity as your hot-swap disk drives, do not use Automatic mode. See "Custom Configuration," next in this guide, for recommendations on making best use of your non-hot-swap devices. If Automatic configuration will suit your needs, you can proceed to Chapter 5, "Configuration." However, you are encouraged to read the entire planning section to determine whether or not a custom configuration would better meet your needs. Custom Configuration To plan a custom configuration, you will do the following: • Plan your non-hot-swap devices (only if integrated HP NetRAID is enabled for SCSI B) • Plan your arrays • Plan hot spares • Decide the rebuild rate • Plan logical drives 28