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Rebuild an Array
An array is in one of three states: Normal, Degraded, and Damaged. You can maintain disks in time
by checking the disk status to take advantage of the disk array and ensure the security and
reliability of data storage.
Note:
To be alerted when an array is degraded or damaged, you can configure alarm- triggered
actions under Menu > Alarm > Alert.
Go to Menu > Storage > Array > Array.
Array Status
Normal
Damaged
Degraded
Note: For example, in a RAID 5 array with 4 disks, the array is in Degraded state when 1 disk is
lost, and in Damaged state when 2 disks are lost.
Automatically Rebuild an Array
A degraded array can be automatically rebuilt in ten minutes if a global hot spare disk is available
and the capacity of the global hot spare disk is not less than that of the smallest disk in the array.
Note: After rebuilding, replace the failed disk in time and set the replaced disk as a global hot
spare to ensure the stable operation of the array. See
Manually Rebuild an Array
A degraded array can only be rebuilt manually if no global hot spare disk is available.
Note: Before you start, check if there is an available physical disk. If no, you need to replace the
failed disk.
1. Go to Menu > Storage > Array > Array.
2. Select the array to be rebuilt and click
3. Select the rebuild mode and local disk. The Quick rebuild mode takes less time than the
Normal rebuild mode, but may result in data loss. Please select with caution.
4. Click Apply.
Description
The array is functional.
The number of physical disks lost exceeds the allowable limit for this
type of array and the lost disks cannot be rebuilt.
A state between Normal and Damaged.
.
140
UNIGUARD 4 & 8 HDD Series
Manually Rebuild an Array
for details.
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