HP 3000 Enterprise Virtual Array - Manual (Page 230)

Glossary
230 Enterprise Virtual Array 3000 User Guide
unwritten cached data
Also called unflushed data.
See also dirty data.
UPS
Uninterruptible Power Supply. A battery-operated power supply guaranteed to provide power
to an electrical device in the event of an unexpected interruption to the primary power supply.
Uninterruptible power supplies are usually rated by the amount of voltage supplied and the
length of time the voltage is supplied.
VCS
Virtual Controller Software. Provides storage controller software capability for the HSV
Controller.
VD
Virtual Disk. A simulated disk drive created by the controllers as storage for one or more
hosts. The virtual disk characteristics, chosen by the storage administrator, provide a specific
combination of capacity, availability, performance, and accessibility. A controller pair
simulates the characteristics of the virtual disk by deploying the disk group from which the
virtual disk was created.
The host computer sees the virtual disk as “real,” with the characteristics of an identical
physical disk.
See also active virtual disk, virtual disk copy, virtual disk family, and virtual disk
snapshot
virtual disk
See VD.
virtual disk copy
A clone or exact replica of another virtual disk at a particular point in time. Only an active
virtual disk can be copied. A copy immediately becomes the active disk of its own virtual disk
family.
See also active virtual disk, virtual disk family, and virtual disk snapshot
virtual disk family
A virtual disk and its snapshot, if a snapshot exists, constitute a family. The original virtual
disk is called the active disk. When you first create a virtual disk family, the only member is
the active disk.
See also active virtual disk, virtual disk copy, and virtual disk snapshot.