NEC Storage ThinProvisioning

	Basic information

NEC Storage ThinProvisioning provides function to dynamically allocate capacity corresponding to the amount of the data written to the volume.

This function provides the following effects.

Reduction of initial cost

Initial introduction cost is reduced as the system operation can be started with fewer disk drives than a system without this function.

Reduction of power consumption

Power consumption and emission of CO2 is reduced while equipping fewer disk drives to a disk array.

Efficient use of capacity

Capacity can be used efficiently as an unused space is allocated to other services etc.

Capacity change without interruption of service

When data increase yields to lack of disk array capacity, the capacity of a disk array is increased without interruption by adding disk drives.

Terminology

virtual capacity	recognized capacity where actual space is not allocated
actual capacity	space allocated to the pool with actual space
allocated capacity	actual space allocated to a virtual capacity logical disk from a pool

	Function

	Functions

	By using NEC Storage ThinProvisioning, a pool and a logical disk can be created with virtual capacity.

	Reference function for a virtual capacity pool and a virtual logical disk

	Information on a virtual capacity pool and a virtual capacity logical disk (virtual capacity, actual capacity, allocated capacity, threshold of capacity, etc.) is displayed on iSM main window of iSM client.

	Configuration, modification and release function of a virtual capacity pool and a virtual logical disk

	On configuration setting screen of iSM client, the product configures, modifies and releases a virtual capacity pool and a virtual capacity logical disk. The following items can be modifed by the modification function. - virtual capacity of a logical disk - actual capacity - threshold of actual capacity allocated to a virtual capacity pool - threshold and quota of allocated capacity of a virtual capacity logical disk

	Monitoring capacity of a virtual capacity pool and a virtual capacity logical disk.

	The product monitors capacity of a virtual capacity pool and a virtual capacity logical disk. When threshold or quota is exceeded or lack of capacity is occurred, message is logged (for UNIX, in operation log and syslog, for Windows, operation log and event log)