3.10 Rebuild
The rebuild feature can recover redundancy if a single HDD is defected in RAIL level 1, 10 or 5.
During rebuild, data read/write is enabled. However, the redundancy is lost until the rebuild operation is completed.
If an HDD is defected, logical drives are entered into the critical state, of which you are notified.
IMPORTANT: Note that load is applied to the system to decrease its processing rate during rebuild.
3.10.1 Hot Spare Rebuild
If a redundant logical drive is degraded, hot spare rebuild is done under where all the following conditions match.
Spare drives are set. | Spare drives of either of the following types are required: | |
| • | Spare drives set to global |
| • | Spare drives dedicated for logical drive entered into degraded |
|
| state |
Spare drives have capacity set | Spare drives should have capacities equal to or larger than | |
properly. | those of defected physical drives. | |
When the above conditions are met, host spare rebuild is started automatically. (The physical drives that is not configured to any disk arrays cannot be used as spare drives.)
3.10.2 Hot Swap Rebuild
Hot swap rebuild is done when the following conditions are met.
Auto Rebuild is enabled. | Enable Auto Rebuild should be checked in the Settings screen |
| appearing in the Background Activities tab of subsystem ST |
| EX4650EL. See the description of the Background Activities tab in |
| "3.5.1 Subsystem (ST EX4650EL) icon" for details. |
A defected physical drive is | The new HDD should have a capacity equal to or larger than that |
replaced with a new HDD on | of the defected physical drive. |
the same slot. |
|
If the above conditions are met, hot swap rebuild is started automatically.
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