Online Capacity Expansion (OCE)
This feature allows disks to be added to exis ting RAID arrays, in order to increase the array’s capacity, without fear of data loss. Any number of disks can be added to an array, at any time. Data can be accessed and utilized even while being redistributed.
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, OLRM and the RocketRAID 2220
The RocketRAID 2220 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 simultaneously 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 2220 that contain valid partition tables will be identified as legacy disks . A legacy disk attached to the RocketRAID 2220 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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