Operations Manual
7.3About RAID Global and Hot Spares
A hot spare is a drive that is on standby in case another drive fails. Depending on how the array is configured, the drive is either picked up automatically and the array is rebuilt, or you manually select the drive (or insert a new drive in the same slot as the failed drive) and rebuild the array.
How the hot spare works depends on how the array is configured. When a drive fails, the array rebuilds automatically using the hot spare. This is assuming that automatic rebuild is enabled. If automatic rebuild is disabled, you must manually start the rebuild process.
During a rebuild you may notice degraded performance on the drives.
7.4Global and Dedicated Hot Spares
A dedicated hot spare is assigned to one or more arrays, whereas a global hot spare can be used for any array that is on the same controller as the hot spare. Also, dedicated hot spares that reside in the same storage enclosure typically have better performance than global hot spares.
Part Number: 1008080Page 81 of 82
Version 1.4. 01/12/2010