HP StorageWorks SAN Virtualization Services Platform Manager User Guide (5697-0454, May 2010)

thick provisioned A quality of virtual disks wherein the virtual disk’s allocated capacity is always
equal to its total capacity.
See also virtual disk.
thin provisioned A quality of virtual disks wherein the virtual disk’s allocated capacity is set to a
small initial value that can expand up to the virtual disk’s total capacity according
to actual usage.
transceiver A device that provides an interface between the Data Path Module hardware
and the external network cable. The Data Path Module uses 4–Gbps optical
small form-factor pluggable transceivers.
UDH User defined hosts are all servers other than the VSM servers that are attached
to the SVSP domain.
valid boot set A DPM boot set that contains a usable system image.
VDG Virtual Disk Group. A single entity that encapsulates multiple virtual disks or
snapshots to enable synchronized operations on the members.
virtual disk In VSM, a unit of storage allocated to one or more hosts from a storage pool. A
virtual disk can range in size from 1 GB to 2 TB. DPMs present allocated virtual
disks to hosts as logical drives.
Volume Shadow
Copy Service
A backup infrastructure for the Microsoft Windows Server 2003/2008 operating
systems, as well as a mechanism for creating consistent point-in-time copies of
data known as shadow copies.
VSM Virtualization Services Manager. Short for the HP StorageWorks SAN
Virtualization Services Platform Manager application.
VSM API virtual
disk
A virtual disk that enables a host to direct VSM CLI commands to a VSM server
through a DPM. May also be seen as SANAPI on the VSM GUI Maintenance
screen.
VSM client The management interface for VSM servers. The VSM client runs on any PC
connected to a VSM server workstation through an IP connection.
VSM GUI Graphical user interface used to manage the HP StorageWorks SAN Virtualization
Services Platform environment.
VSM server VSM software that runs on a dedicated appliance connected to a SAN fabric
and manages and controls all storage systems on the SAN. A VSM server
virtualizes the storage space on the storage systems, creates storage pools and
virtual disks, and provides agents with virtual disk information. The VSM server
also moves data in snapclone, migration, and asynchronous mirroring operations.
VSS See Volume Shadow Copy Service.
VSS freeze A period of time during the shadow copy creation process when all services
(writers) have flushed their writes to the volumes and are not initiating additional
writes.
VSS thaw The completion of a VSS shadow copy freeze.
WWNN World Wide Node Name. The globally unique identifier for a system containing
Fibre Channel ports.
Glossary388