Normalization; Low-Level Refresh Of Virtual Disks; Lun; Preferred Controller - HP 418800-B21 - StorageWorks Modular Smart Array 70 Storage Enclosure User Manual

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