HP SAN Virtualization Services Platform - Manual (Page 75)

stripe set In VSM, a set of back-end LUs across which VSM stripes data, optionally used to build storage
pools.
SVSP domain Consists of all SVSP components and the storage they manage.
synchronous
mirroring A mode of data mirroring in which the updates on the mirror site are synchronized between
destinations.
system software
image A software component, capable of being updated, that contains the operating environment for
the Data Path Module, including the SVSP VSM agent for the Data Path Module.
T
target Receives commands from the initiator, and after execution, returns acknowledgement to the
initiator.
See also initiator..
target device A device that contains one or more target ports.
target port A Fibre Channel port capable of presenting one or more SCSI LUNs to servers. A target is also
known as the destination of a server's I/O request.
task In VSM, a process that carries out a data moving task on a group.
temporary virtual
disk A virtual disk created when a PiT is created on another virtual disk. The temporary virtual disk
holds any modifications redirected from the original virtual disk after the PiT is created.
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.
transaction
consistent The state of the media behind a logical unit, such that all pending writes have been completed,
and all caches are empty.
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.
trunk A group of interswitch links (ISLs) configured to work together to connect two Fibre Channel
switches with a higher bandwidth than a single ISL. Each trunk is treated as a single path for the
switch to route I/O destined for a device on the other switch.
U
UDH User defined hosts are all servers other than the VSM servers that are attached to the SVSP domain.
V
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.
VMA Virtualization Management Appliance.
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.
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