User guide

5. During rebuild, the data read/write is enabled. However, the redundancy is lost until the
rebuild operation is completed.
If an HDD is defective, the logical drive enters the critical state, and you are notified.
IMPORTANT: During rebuild, the system is subject to a
heavy load and thus the processing rate is decreased.
3.10.1 Hot Spare Rebuild
If a redundant logical drive is degraded, hot spare rebuild under the following conditions:
Spare drives are set. • Either spare drives set to global
• Or spare drives dedicated for the logical drive in degraded
state
Spare drives have capacity set
properly.
Spare drives should have capacities equal to or larger than
those of the defected physical drives.
When the above conditions are met, the host spare rebuild is starts automatically. (A physical
drives that is not configured to any disk array cannot be used as a spare drive.)
3.10.2 Hot Swap Rebuild
Hot swap rebuild is done under the following conditions:
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
replaced with a new HDD on
the same slot.
The new HDD should have a capacity equal to or larger than that
of the defective physical drive.
If the above conditions are met, the hot swap rebuild starts automatically.
3.10.3 Manual Rebuild
To perform a manual rebuild, follow the procedure below.
1. Click on a degraded disk array in the Tree View.
2. Click the arrow at the right end of the Background Activities tab in the Management Window
and select Start Rebuild
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