Definition

RAID rebuild

A RAID rebuild is the data reconstruction process that occurs when a hard disk drive needs to be replaced. 

When a disk fails unexpectedly, a RAID array copies data to a spare drive while the failed one is replaced. Data is then reassembled on the new drive using RAID algorithms and parity data. RAID rebuilds can also be proactive if the RAID array detects that a hard drive is about to fail. During the rebuild, the performance of some applications or processes may be negatively affected by latency.

RAID rebuild times are an important concern for storage administrators. Higher capacity drives or multiple failed drives can result in longer rebuild times that take days. 

 

Contributor(s): Sarah Wilson
This was last updated in March 2014
Posted by: Margaret Rouse

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