HP Surestore Disk Array FC60 HP SureStore E Disk Array FC60 - (English) Advanc - Page 77
Recommended Disk Array Configurations, Configuration Considerations
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Recommended Disk Array Configurations Topology and Array Planning 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, which is used for factory assembled disk arrays (A5277AZ). The configurations identify the number of disk enclosures, cable connections, disk enclosure bus modes, RAID level, and LUN structure. Most of the configurations offer the highest level of availability, which means they are capable of surviving the failure of a single disk (provided LUNs are created with one disk module per disk enclosure), SCSI channel, 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 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 HP-UX" on page 102 or "Topologies for Windows NT and Windows 2000" on page 131. Recommended Disk Array Configurations 77