HighPoint RocketRAID 2340 - Manual (Page 9)

Introduction
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OCE, ORLM and the RocketRAID 2340
The RocketRAID 2340 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 2340 that contain valid partition tables will be
identified as legacy disks. A legacy disk attached to the RocketRAID 2340 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.