HP Surestore Disk Array FC60 HP SureStore E Disk Array FC60 - (English) Advanc - Page 448
hot swappable, I/O operation, image disk image, logical unit LUN
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host A processor that runs an operating system using a disk array for data storage and retrieval. hot swappable Hot swappable components can be removed and replaced while the disk array is online without disrupting system operation. Disk array controller modules, disk modules, power supply modules, and fan modules are all hot swappable components. I/O operation An operation initiated by a host computer system during which data is either written to or read from a peripheral. image (disk image) See mirroring. JBOD An acronym for Just a Bunch Of Disks, it implies an enclosure that houses disk drives that by themselves do not provide data redundancy. The disk systems on the disk array are JBOD devices, but when connected to the disk array controllers, they provide data redundancy through the use of RAID technology. link In Fibre Channel, two unidirectional fibres transmitting in opposite directions and their associated transmitters and receivers that serve as the communication media between nodes in a topology. A link is comparable to a bus in the SCSI protocol. logical unit (LUN) An acronym for Logical Unit Number, the SCSI term for logical disk unit. A logical unit is an addressable part of a SCSI target. The terms "logical unit number" and "LUN" are interchangeable. The LUN is the basic storage entity created on the disk array. Each LUN appears to the host as a single hard disk drive. Multiple LUNs, each using different RAID levels, can be 448