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Glossary
VCS Virtual Controller Software. Provides storage controller software capability
for the HSV controller.
Vdisk Virtual Disk. A simulated disk drive created by the controllers as storage for
one or more host
s. 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.
virtual disk family A grouping that consists of a virtual disk and its snapshot, if a snapshot exists.
The original v
irtual disk is called the active disk. When you first create a
virtual disk family, the only member is the active disk.
Vraid0 A virtualization technique that provides no data protection. A data host is
broken down into chunks and distributed on the disks comprising the disk
group from wh
ich 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.
Vraid1 A virtualization technique that provides the highest level of data protection.
All data bloc
ks are mirrored or written twice on separate physical disks. For
read requests, the block can be read from either disk, which can increase
performance. Mirroring takes the most storage space because twice the
storage capa
city must be allocated for a given amount of data.
Vraid5 A virtualiz
ation technique that uses parity striping to provide moderate data
protection. Parity is a data protection mechanism for a striped virtual disk. A
striped virtual disk is one where the data to and from the host is broken down
into chunks
and distributed on the physical disks comprising the disk group in
which the virtual disk was created. If the striped virtual disk has parity, another
chunk (a parity chunk) is calculated from the set of data chunks and written to
the physica
l disks. If one of the data chunks becomes corrupted, the data can
be reconstructed from the parity chunk and the remaining data chunks.
WWN World Wide Name. A unique Fibre Channel identifier consisting of a
16-character hexadecimal number. A WWN is required for each Fibre
Channel co
mmunication port.
hp StorageWorks Enterprise Virtual Array Updating Product
Software Instructions
131