HP P3410A HP NetRAID 1M/2M Installation & Configuration - Page 36

Chapter 4 Planning As explained in Chapter 1, "Introduction," for each channel, you have either one internal or one external connection. HP NetRAID-1M and 2M adapters support the following channels and connectors: • The HP NetRAID-1M adapter provides an internal and external connector for Channel 0. • The HP NetRAID-2M adapter provides internal and external connectors for Channels 0 and 1. SCSI Transfer Rate ! On Worksheet A, record the SCSI transfer rate for each channel. The default SCSI transfer rate is Ultra3, but you can change this rate to Fast, Ultra, or Ultra2. 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. 28