Promise Technology FastTrak SX Series Version 4.4 - Manual (Page 80)

Promise Array Management
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Rebuild an Array
To Rebuild to restore redundancy to a RAID 1, 0+1 or 5 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.
Figure 75. An Array in Critical condition highlighted in Tree View (left)
and shown in red in Information View (right).
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 Policy below.
If the popup messages are enabled, one will notify you when the rebuild is
successfully completed. The array will return to Functional status.