User manual

Chapter 5: RAID Monitoring and Maintenance
69
Rebuild an Array
To Rebuild is to restore redundancy to a RAID 1 or 0+1 after one of its drives
has failed. Unlike Synchronization, a Rebuild is a repair operation.
When a drive fails for any reason, the Array goes Critical. An Array Critical
icon displays in Tree View and the RAID alarm beeps quickly to call your
attention to the condition.
Automatic Rebuild
Normally, the rebuild process begins automatically when you replace the faulty
disk drive.
The Array recognizes the new or spare drive and begins the process a few
moments later.
If your array has a Hot Spare drive, the rebuild begins without waiting for a
replacement drive.
Be sure to replace the faulty drive as soon as possible.
During the Rebuild process, the array is still available to read and write data but
it may run noticeably slower.
To enable a Hot Spare drive, change the Rebuild settings and shut off the
beeper, see Rebuild Settings, below.
If the popup messages are enabled, one will notify you when the rebuild is
successfully completed. The array will return to Functional status.