HP Surestore Disk Array FC60 HP SureStore E Disk Array FC60 Service Manual (A5 - Page 73
Recommended Disk Array Configurations, Configuration Considerations
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Topology and Array Planning Recommended Disk Array Configurations This section presents recommended configurations for disk arrays using one to six disk enclosures. Configurations are provided for achieving high availability/high performance, and maximum capacity. The configuration recommended by Hewlett-Packard is the high availability/ high performance configuration. The configurations identify the number of disk enclosures, cable connections, disk enclosure bus modes, RAID level, and volume groupstructure. Most of the configurations offer the highest level of availability, which means they are capable of surviving the failure of a single disk (provided volume groups are created with one disk module per disk enclosure), SCSI channel, SC10 disk enclosure, or controller module. The only configurations that do not offer the highest level of availability are the single disk enclosure configuration, and the two enclosure high capacity configuration. These configurations cannot survive the failure of an entire disk enclosure, so they should not be used in environments where high availability is critical. The configurations list maximum disk capacity and usable disk capacity (with ten disk modules installed). Configurations based on RAID 1 have less usable disk capacity than RAID 5, but I/O performance is optimized when using RAID 1. Although the recommended configurations presented here all contain ten disk modules, a disk enclosure can contain two, four, eight, or ten disk modules. Note The terms "LUN" and "volume group" are used interchangeably in the text and figures in this section. Configuration Considerations The following factors should be considered when using any of the recommended configurations. • Multiple Hosts - A single host system is shown, but configurations can be adapted to create multi-host, high availability systems. For more information on using multiple hosts, see "Topologies for Windows NT and Windows 2000" on page 98. Recommended Disk Array Configurations 73