Install Guide

6 Citrix XenServer with Dell SC Series Storage Configuration and Deployment | 3132-CD-V
1.4 Terminology
The following terms are used throughout this document:
Note: Definitions identified with an asterisk (*) are provided by the Citrix XenServer 7.0 Administrator’s
Guide, which is available on the Citrix Product Documentation website.
Fault domain (FD): A set of hardware components that share a single point of failure. For controller-level
redundancy, fault domains are created for SC Series storage to maintain connectivity in the event of a
controller failure. In a dual-switch topology, each switch acts as a fault domain with a separate subnet and
VLAN. Failure of any component in an FD will not impact the other FD.
iSCSI offload engine (iSOE): Technology that can free processor cores and memory resources to increase
I/O operations per second (IOPS) and reduce processor utilization.
iSCSI Qualified Names (IQNs): Unique iSCSI initiator (host server) or iSCSI target (storage) addresses are
referred to as iSCSI Qualified Names (IQNs). IQNs are the identifiers used for iSCSI connectivity between
host servers and iSCSI storage platforms.
Link aggregation group (LAG): A group of Ethernet switch ports configured to act as a single high-
bandwidth connection to another switch. Unlike a stack, each individual switch must still be administered
separately and function independently.
Local area network (LAN): A network carrying traditional IP-based client communications.
Logical unit (LUN): A number identifying a logical device, usually a volume that is presented by an iSCSI or
Fibre Channel storage controller.
Multipath I/O (MPIO): A host-based software layer that manages multiple paths for load balancing and
redundancy in a storage environment.
Native VLAN and default VLAN: The default VLAN for a packet that is not tagged with a specific VLAN or
has a VLAN ID of 0 or 1. When a VLAN is not specifically configured, the switch default VLAN will be utilized
as the native VLAN.
Network interface card (NIC): A network interface card or network interface controller is an expansion board
inserted into the computer/server so that the computer/server can connect to a network. Most NICs are
designed for a particular type of network (typically Ethernet) protocol (typically TCP/IP) and media.
Physical Block Devices (PBDs)*: Physical Block Devices represent the interface between a physical server
and an attached Storage Repository (SR). PBDs are connector objects that allow a given SR to be mapped to
a XenServer host. PBDs store the device configuration fields that are used to connect to and interact with a
given storage target.
Storage area network (SAN): A Fibre Channel, Ethernet, or other specialized network infrastructure
specifically designed to carry block-based traffic between one or more servers to one or more storage and
storage inter-process communications systems.