Chapter 5: Protecting Your Data ● 54Creating and Managing Hot SparesA hot spare is a disk drive that automatically replaces any failed drive in a logical drive, and cansubsequently be used to rebuild that logical drive. (For more information on recovering from adisk drive failure, see page 137.)Hot Spare Limitations● You can’t create a hot spare for RAID 0 logical drives, simple volumes, or spanned volumes.● You can’t create a hot spare from a disk drive that is already part of a logical drive.● You should select a disk drive that is at least as big as the largest disk drive it might replace.● Adaptec recommends that you not designate a SAS hot spare for a logical drive comprisingSATA disk drives, or a SATA hot spare for a logical drive comprising SAS disk drives.Dedicated Spare or Global Spare?A global hot spare is not assigned to a specific logical drive and will protect any logical drive onthe controller (except RAID 0 logical drives). You can designate a global hot spare before orafter you build logical drives on a controller; you can also designate a global hot spare whileyou’re creating a logical drive. To designate a global hot spare, see page 54.A dedicated hot spare is assigned to one or more specific logical drives and will only protectthose logical drives. (A dedicated hot spare that has been assigned to protect more than onelogical drive is called a pool spare.) You must create the logical drive before you can assign adedicated hot spare. To assign a dedicated hot spare or pool hot spare, see page 55.Designating a Global Hot SpareThis section describes how to designate a global hot spare before or after you build a logical drive.Note: To designate a global hot spare while you’re creating a logical drive, see Step 7 on page 38.To designate a global hot spare:1 In the Enterprise View, click the controller on which you want a global hot spare.2 In the Physical Devices View, click the disk drive you want to designate as a hot spare. (SeeHot Spare Limitations for help selecting a disk drive.)3 Click the Create global hot-spare drive button.A plus sign appears beside the selected disk drive, indicating that it’s designated as a hotspare. (A yellow plus sign indicates an error. See What Do the Hot Spare Icons Mean? on page55 for help solving the problem.) A plus sign also appears beside each existing logical drive.Any other logical drives created on the controller will automatically be protected by thatglobal hot spare.
