HP 418800-B21 HP StorageWorks Replication Solutions Manager 4.0.1 user guide ( - Page 436

Normalization Snapclone normalization (unsharing) Snapclone normalization is a local replication background process in which a storage system copies the data from the initial snapshot to an independent virtual disk. Snapclone normalization is also called unsharing. Some actions should not be performed during snapclone normalization. When creating jobs, use wait commands to ensure that normalization is completed. See WaitStorageVolumeNormalization, WaitStorageVolumesNormalization, and WaitVolumeGroupNormalization. Remote copy normalization Remote copy normalization is a remote replication background process in which two storage systems ensure that the data on the source and destination virtual disks in a DR group are identical. Some actions should not be performed during remote copy normalization. When creating jobs, use wait commands to ensure that normalization is completed. See WaitDrGroupNormalization. Low-level refresh of virtual disks Update replication manager database entries by manually performing a discovery and refresh of individual virtual disks. The action does the following: • Performs a discovery refresh at the storage system level to gather the properties of the specified virtual disks. • Updates the replication manager database with the new properties. Low-level refresh by specifying a DR group When applied to a DR group, the properties of the log disk and the DR group state are updated. To update the properties the DR group pair, apply to the source and destination DR groups. LUN In each storage system, logical unit numbers (LUNs) are assigned to its virtual disks. When a virtual disk is presented to hosts, the storage system and the hosts perform I/O by referencing the LUN. At a low level, a host OS typically reports each storage device that it detects in the format of c# t# d#, where: C # identifies a host I/O controller T # identifies the target storage system on the controller D # identifies the virtual disk (LUN) on the storage system Automatic LUN assignment • When presenting a virtual disk to a host, enter zero (0) to allow the storage controller software to automatically assign the LUN. Preferred controller Preferred controller specifies which controller manages and presents the virtual disk. The primary purpose is for load balancing. Although set by a storage administrator, the controller software can override the setting when required. Values are: 436 Virtual disks