HP XP20000/XP24000 HP StorageWorks XP Disk Array Configuration Guide (T5278-96 - Page 179
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Glossary AL-PA command device CU CVS emulation mode failover FC FC-AL FCA FCP HBA host mode LD, LDEV LUN LUSE OFC OPEN-x PA path Arbitrated loop physical address. A 1-byte value that the arbitrated loop topology uses to identify the loop ports. This value becomes the last byte of the address identifier for each public port on the loop. A volume in the disk array that accepts Continuous Access, Business Copy, or P9000 for Business Continuity Manager control operations, which are then executed by the array. Control unit. Custom volume size. CVS devices (OPEN-x CVS) are custom volumes configured using array management software to be smaller than normal fixed-size OPEN system volumes. Synonymous with volume size customization (VSC). OPEN-V is a CVS-based volume. The LDEVs associated with each RAID group are assigned an emulation mode that makes them operate like OPEN system disk drives. The emulation mode determines the size of an LDEV. OPEN-3: 2.46 GB OPEN-8: 7.38 GB OPEN-9: 7.42 GB OPEN-E: 13.56 GB OPEN-K: Not available OPEN-L: 36 GB OPEN-M Not available OPEN-V: User-defined custom size The process that occurs when one device assumes the workload of a failed companion device. Failovers can be planned or unplanned. Fibre Channel. A network technology primarily used for storage networks. Fibre Channel arbitrated loop. Fibre Channel Adapter. Fibre Channel Protocol. Host bus adapter. Each port can be configured for a particular host type. These modes are represented as two-digit hexadecimal numbers. For example, host mode 08 represents an HP-UX host. Logical device. An LDEV is created when a RAID group is carved into pieces according to the selected host emulation mode (that is, OPEN-3, OPEN-8, OPEN-9). The number of resulting LDEVs depends on the selected emulation mode. The term LDEV is also known as term volume. Logical unit number. A LUN results from mapping a SCSI logical unit number, port ID, and LDEV ID to a RAID group. The size of the LUN is determined by the emulation mode of the LDEV and the number of LDEVs associated with the LUN. For example, a LUN associated with two OPEN-3 LDEVs has a size of 4,693 MB. Logical Unit Size Expansion. The LUSE feature is available when the HP StorageWorks LUN Manager product is installed, and allows a LUN, normally associated with only a single LDEV, to be associated with 1 to 36 LDEVs. Essentially, LUSE makes it possible for applications to access a single large pool of storage. Open Fibre Control. A general term describing any one of the supported OPEN emulation modes (for example, OPEN-E. There are two types of OPEN-x devices: legacy OPEN-x devices with a fixed size (such as, OPEN-3, OPEN-8, OPEN-9, OPEN-E), and OPEN-V, which has a variable size and is a CVS based volume. Physical address. A path is created by associating a port, a target, and a LUN ID with one or more LDEVs. Also known as a LUN. 179
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