124 Configuration: Disk Groups and Virtual Disksthe failed physical disk to the hot spare physical disk. When you havephysically replaced the failed physical disk, a copyback operation occurs fromthe hot spare physical disk to the replaced physical disk.If there are secure disk groups and security capable disk groups in the storagearray, the hot spare physical disk must match the security capability of thedisk group. For example, a non-security capable physical disk cannot be usedas a hot spare for a secure disk group.NOTE: For a security capable disk group, security capable hot spare physical disksare preferred. If security capable physical disks are not available, non-securitycapable physical disks may be used as hot spare physical disks. To ensure that thedisk group is retained as security capable, the non-security capable hot sparephysical disk must be replaced with a security capable physical disk.If you select a security capable physical disk as hot spare for a non-secure diskgroup, a dialog box appears indicating that a security capable physical disk isbeing used as a hot spare for a non-secure disk group.The availability of enclosure loss protection for a disk group depends on thelocation of the physical disks that comprise the disk group. The enclosure lossprotection might be lost because of a failed physical disk and location of thehot spare physical disk. To make sure that enclosure loss protection is notaffected, you must replace a failed physical disk to initiate the copybackprocess.The virtual disk remains online and accessible while you are replacing thefailed physical disk, because the hot spare physical disk is automaticallysubstituted for the failed physical disk.Enclosure Loss ProtectionEnclosure loss protection is an attribute of a disk group. Enclosure lossprotection guarantees accessibility to the data on the virtual disks in a diskgroup if a total loss of communication occurs with a single expansionenclosure. An example of total loss of communication might be loss of powerto the expansion enclosure or failure of both RAID controller modules.CAUTION: Enclosure loss protection is not guaranteed if a physical disk hasalready failed in the disk group. In this situation, losing access to an expansionenclosure and consequently another physical disk in the disk group causes adouble physical disk failure and loss of data.
