Overland Storage SnapServer Administrator's Manual page 268

SnapServer 7.0 Administrator's Guide
Unassigned
The state of a disk drive that is seated in a bay but has not been incorporated into a RAID.
Unassigned Free Space
The controller keeps a map of all the space that is not assigned to any logical drive. This
space is available for creation or expansion. Each unassigned region is individually listed.
UNC
Short for Universal Naming Convention. In a network, a way to identify a shared file in a
computer without having to specify (or know) the storage device it is on. In the Windows
OS, the UNC name format is as follows:
\\server_name\share_name\path\file_name
UPS
Short for Uninterruptible Power Supply. A device that allows a computer to keep running
for a short time when the primary power source is lost. It also provides protection from
power surges. A UPS device contains a battery that starts when the device senses a loss of
power from the primary source.
URL
Short for Uniform Resource Locator. A Web address.
USB Port
USB is short for Universal Serial Bus. A USB port is a hardware interface for low-speed
peripherals such as the keyboard, mouse, joystick, scanner, printer, and telephony devices.
VDS
Short for Virtual Disk Service. VDS is a feature of Microsoft Windows (from Windows
Server 2003 onwards). It provides a consistent interface for managing storage devices and
creating volumes. Each vendor of a storage solution can write their own hardware provider
module that enables the standard set of VDS commands to be used with different
enclosures. Thus, multiple storage systems by different vendors can be controlled using the
same set of VDS commands.
Virtual LUN
See Snapshot
VLAN
Short for Virtual LAN. It consists of a network of computers that behave as if they are
connected to the same wire - even though they may actually be physically connected to
different segments of a LAN.
Volumes
A logical partition of a RAID's storage space that contains a filesystem. Volumes are created
from storage pools, using unused capacity in a pool. They can be extended in size, so long as
there is free capacity in the pool.
A volume appear to a host computer just like a regular, physical disk except that it is
attached by means of iSCSI instead of traditional disk interconnects such as IDE, SCSI or
SATA.
10400317-001 10/2011
LUN.
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