TACACS+ Terminal Access Controller Access Control System Plus. A client-server protocol.
TDM Time-division multiplexing.
TOE TCP Offload Engine.
topology The physical structure of interconnected components that form a network.
ToR Top of Rack (switch)
TR Transparent router. A routed fabric feature that provides inter-fabric routing,
allowing controlled and limited access between devices on an H-series switch
(local) fabric and devices on a remote fabric of other vendor switches.
TSID Target session ID.
UA User Agent. An iSCSI software component.
unified fabric IEEE DCB enabled network (Cisco).
USD UltraNet Storage Director (Brocade-McDATA firmware).
VAR Value-added reseller.
VC-Enet Virtual Connect Ethernet. A hardware component of HP Virtual Connect.
VC-FC Virtual Connect Fibre Channel. An optional Fibre Channel interconnect module
for HP BladeSystem c-Class servers.
VCS Virtual Controller Software. The software that runs in the HSV controller-based
Enterprise Virtual Array GL model storage systems.
VIO Versatile I/O.
VLAN Virtual logical area network.
VLS Virtual Library System.
VM Virtual machine.
VOQ Virtual output queuing. A C-series feature used for nonblocking architecture.
VOS Virtual operating system.
VPN Virtual private network.
VSAN Virtual storage area network. A logical SAN partition that can be configured
and managed independently.
VSM Virtualization Services Manager. An HP SVSP GUI used to manage all objects
in the domain.
VSS Volume Shadow Copy Service. Microsoft software used to make snapshots.
WDM Wavelength division multiplexing. The technique of placing multiple optical
signals on a single optical cable simultaneously.
See also CWDM and DWDM.
WWN World Wide Name. A unique identifier assigned to a Fibre Channel device.
SAN Design Reference Guide 441
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