HP EVA P6550 HP P6300/P6500 EVA User Guide (5697-2486, September 2013) - Page 305

loop loop ID loop pair LTEA LUN M management agent management agent event management server MB Mb MBps Mbps mean time between failures Mega metadata micro meter mirrored caching mirroring MTBF multi-mode fiber N near-online storage See arbitrated loop. Seven-bit values numbered contiguous from 0 to 126 decimal that represent the 127 valid AL_PA values on a loop (not all 256 hexadecimal values are allowed as AL_PA values per Fibre Channel). A Fibre Channel attachment a controller and physical disk drives. Physical disk drives connect to controllers through paired Fibre Channel arbitrated loops. There are two loop pairs, designated loop pair 1 and loop pair 2. Each loop pair consists of two loops (called loop A and loop B) that operate independently during normal operation, but provide mutual backup in case one loop fails. Last termination event array. A two-digit HSV Controller number that identifies a specific event that terminated an operation. The valid numbers range from 00 to 47. 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. The HP P6000 Command View software that controls and monitors the Enterprise storage system. The software can exist on more than one management server in a fabric. Each installation is a management agent. A significant occurrence to or within the management agent software, or an initialized storage cell controlled or monitored by the management agent. A server on which management software is installed, such as HP P6000 Command View and HP Replication Solutions Manager. Megabtye. A term defining either: • A data transfer rate. • A measure of either storage or memory capacity of 1,048,576 (220) bytes. See also MB. Megabit. A term defining a data transfer rate. See also Mbps. Megabytes per second. A measure of bandwidth or data transfers occurring at a rate of 1,000,000 (106) bytes per second. Megabits per second. A measure of bandwidth or data transfers occurring at a rate of 1,000,000 (106) bits per second. See MTBF. A notation denoting a multiplier of 1 million (1,000,000). The data in the first sectors of a disk drive that the system uses to identify virtual disk members. See µm. A process in which half of each controller's write cache mirrors the companion controller's write cache. The total memory available for cached write data is reduced by half, but the level of protection is greater. The act of creating an exact copy or image of data. Mean time between failures. The average time from start of use to first failure in a large population of identical systems, components, or devices. A fiber optic cable with a diameter large enough (50 microns or more) to allow multiple streams of light to travel different paths from the transmitter to the receiver. This transmission mode enables bidirectional transmissions. On-site storage of data on media that takes slightly longer to access than online storage kept on high-speed disk drives. 305