If a hard drive that is implemented as part of a RAID-3 array fails, your data is at risk but not lost. RAID-3 is a method of arranging at least three hard drives in an array to increase performance and provide fault tolerance. Data is split into blocks before storage and is written to all data disks in the array simultaneously. This process is known as division. The calculation is done against the data bits that result in what is known as a parity bit. This parity information is stored on a separate disk. If a single disk fails, the array can be rebuilt using the parity information. However, if another fails, the data will be lost. Instructions
Purchase a new drive that is identical to the drive in your array. It is the best practice to keep a complete set of backup units at home to cover any failures.
Remove the failing drive from the server. Each unit will have an LED on the front that will signal its health. Look for a drive with the light off or flashing red. The hot-swappable drive can be pulled off the front of the server while online. Check the server documentation to ensure proper action is taken.
Insert your new disk into the system. Make sure the unit is the same type and size as the one you are replacing. Different technology may not fit in the same port as your old disk and a different size disk can result in problems for the RAID array.
rebuild the matrix. This process will happen automatically on several RAID controllers and the server will be available throughout the process. Check your RAID controller documentation or contact the server manufacturer for more information on rebuilding your individual array.
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