Glossary

L

legacy disk

Disk that contained a valid partition table when connected to the controller. The controller manages the disk as a legacy disk array where there is a one-to-one logical to physical mapping of array to disk.

logical device

Device (disk) comprised of spaces from one or more physical drives and presented to the operating system as if it were one drive.

logical device order

Sequence in which the system’s operating system detects the arrays, single hard disks, and other devices connected to the controller when the server boots.

low-level format

Process performed by the drive firmware that completely cleans any data off the hard disk.

LUN

Logical Unit Number. The number assigned to a subdevice of a SCSI device. Each SCSI device can contain up to eight subdevices numbered 0 through 7. However, most SCSI devices contain only one subdevice (LUN 0).

M

migration

See reconfiguration.

mirror set

See RAID 1.

mirroring; mirrored array

See RAID 1.

A-8