3ware Escalade ATA RAID Controller User Guide166 www.3ware.comSpecifying a hot spareEscalade ATA RAID Controllers give you the option to specify ahot spare from one of your available ports (currently shown asoffline). Hot spares should be selected after mirror or RAID 5 cre-ation. Refer to Creating a disk array in the 3ware Disk Array Con-figuration Utility chapter. To specify a hot spare after the system isbooted, physically add the spare drive and click on the check boxnext to the available offline port; then click on the Add Spare but-ton.Note: Hot spare drives must be equal to or larger thanthe drives used for the redundant array.Auto rebuild of a redundant arrayIf a hot spare is specified and the array degrades, an event notifica-tion is generated and the hot spare dynamically replaces the faileddrive in a redundant array without user intervention. Rebuild willautomatically be launched as background process and an event noti-fication will notify the user when the rebuild process is complete (if3DM is running and e-mail notification is setup).Rebuilding a redundant array with a hotswap driveHot swap allows a user to replace a failed drive in a redundant arraywhile the system remains up. Hot swap can be used when 24x7 sys-tem operation is a consideration. If multiple drives are faulted in aRAID 10 configuration, the drives are rebuilt sequentially startingwith the lowest port number.1 Click on the check box of the failed drive.
