HP 2000fc Hp StorageWorks 2000 Family Modular Smart Array CLI reference guide - Page 265
enclosure, management, processor EMP, Ethernet adapter, Expander Controller, expansion module, fabric
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enclosure management processor (EMP) Ethernet adapter Expander Controller (EC) expansion module fabric fabric switch failback failover fault tolerance An Expander Controller subsystem that provides data about an enclosure's environmental conditions such as temperature, power supply and fan status, and the presence or absence of disk drives. An adapter that connects an intelligent device to an Ethernet network. Usually called an Ethernet network interface card, or Ethernet NIC. (SNIA) The processor (located in the SAS expander in each controller module and expansion module) that is primarily responsible for enclosure management and SES. A FRU that contains: a SAS expander and Expander Controller processor; host, expansion, and service ports; and midplane connectivity. In a drive enclosure, the upper expansion module is designated A and the lower one is designated B. A Fibre Channel switch or two or more Fibre Channel switches interconnected in such a way that data can be physically transmitted between any two N_Ports on any of the switches. (SNIA) A fabric switch functions as a routing engine that actively directs data transfer from source to destination and arbitrates every connection. Bandwidth per node via a fabric switch remains constant when more nodes are added. See recovery. In an active-active configuration, failover is the act of temporarily transferring ownership of controller resources from a failed controller to a surviving controller. The resources include virtual disks, cache data, host ID information, and LUNs and WWNs. See also recovery. The capacity to cope with internal hardware problems without interrupting the system's data availability, often by using backup systems brought online when a failure is detected. Many systems provide fault tolerance by using RAID architecture to give protection against loss of data when a single disk drive fails. Using RAID 1, 3, 5, 6, 10, or 50 techniques, the RAID controller can reconstruct data from a failed disk drive and write it to a spare or replacement disk drive. Glossary 265