Glossary-4Adaptec Ultra320 SCSI Cards User’s GuideIinitialized arrayAn array that is ready for data reads and writes.Llogical deviceA read/write resource, such as an array or spare, that does notexist until configured by the Software Management tool.Logical Unit NumberSee LUN.low-level formatA low-level format completely cleans any data off the hard disk.LUNStands for Logical Unit Number. The number assigned to asubdevice (logical unit) of a SCSI target. Each SCSI target cancontain up to eight subdevices numbered 0 through 7; however,most SCSI devices contain only one subdevice (LUN 0).Mmirroring; mirrored arraySynonym for RAID 1. Full redundancy is obtained by maintainingidentical copies of data on two or more hard disks. Mirroringprovides fault tolerance with a minor performance penalty.monitoringThe process of receiving, displaying, and logging system events.Ooff-line arrayAn array that is not responding.PparityIn RAID, a form of redundancy used to recreate the data of a failedhard disk in a disk array. Used in RAID levels 2, 3, 4, and 5.
