HighPoint RocketRAID 3xxx User Manual page 10

Introduction
Online RAID Level Migration
This term describes the ability to change one type of array (RAID level), into a different
type of array (changing a RAID 1 array into a RAID 10 array for example). Data is still
accessible during the migration process, and a base level of security is still active.
OCE, ORLM and the RocketRAID 3xxx
The RocketRAID 3xxx supports both Online Capacity Expansion (OCE), and Online
RAID Level Migration (ORLM). Both features are supported by a single function - an
array can be transformed from one RAID level to another RAID level while simulta-
neously being resized, even under I/O load.
Spare disk
A spare disk is a single disk that can be used to automatically rebuild a redundant array
in case of drive failure. Spare disks may also be members of a RAID array. Any available
space on these disks may be used to rebuild other broken arrays.
Legacy disk
Disks attached to the RocketRAID 3xxx that contain valid partition tables will be
identified as legacy disks. A legacy disk attached to the RocketRAID 3xxx can be
accessed by the operating system, but cannot be used to create RAID arrays. A
legacy disk must be initialized before assigning it to an array.
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