HP StorageWorks MSA2012i HP StorageWorks 2000 Modular Smart Array Reference Gu - Page 81
Managing Vdisk Spares
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To configure dynamic spares: 1. Select Manage > General Config > System Configuration. 2. Set Dynamic Spare Configuration to Enabled. 3. Click Change System Configuration. When Dynamic Spare Configuration is enabled, the Dynamic Spare Rescan Rate option is displayed. Use the default rescan rate. 4. Click Change System Configuration. Managing Vdisk Spares This section describes how to designate available drives as spares for use by one virtual disk only. It also describes how to return spares to the pool of available drives. Adding Vdisk Spares You can add a maximum of four available drives to a redundant virtual disk (RAID 1, 3, 5, 6, 10, and 50) for use as spares. If a drive in the virtual disk fails, one of these vdisk spares is automatically used to reconstruct the virtual disk. A spare must have sufficient capacity to replace the smallest drive in the virtual disk. Vdisk spares are also called dedicated spares. The controller automatically uses the vdisk spare for reconstruction of the critical virtual disk to which it belongs. The virtual disk remains in Critical status until the parity or mirror data is completely written to the spare, at which time the virtual disk returns to Fault Tolerant status. For RAID 50 virtual disks, if more than one sub-vdisk becomes critical, reconstruction and use of vdisk spares occur in the order sub-vdisks are numbered. Although using a vdisk spare is the most secure way to provide spares for your virtual disks, it is also expensive to keep a spare assigned to each virtual disk. An alternative method is to enable dynamic spares or to assign one or more unused drives as global spares. Chapter 3 Managing Storage 81