HP StorageWorks IBM AIX Kit V3.0B for Enterprise Virtual Array Installation and Configuration Guide (AA-RUHAB-TE, October 2003)

Glossary
56 IBM AIX Kit V3.0B for Enterprise Virtual Array Installation and Configuration Guide
TBps
Terabytes per second. A data transfer rate of 1,000,000,000,000 (10
12
) bytes per second.
uninitialized system
A state in which the storage system is not ready for use.
See also initialization.
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 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.
virtual disk snapshot
See snapshot.
Vraid0
A virtualization technique that provides no data protection. Data from the host is broken
down into chunks and distributed on the disks comprising the disk group from which the
virtual disk was created. Reading and writing to a Vraid0 virtual disk is very fast and makes
the fullest use of the available storage, but there is no data protection (redundancy) unless
there is parity.