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PowerVault™ MD32X0, MD32X0i, and MD36X0i Series of Storage Arrays: Implementing Hyper-V

Appendix B: Terminology

Bandwidth – The amount of data that the storage array can process over time. Bandwidth is measured

in megabytes per second (MB/s).

Initiator – The system component that originates an input/output (I/O) command over an I/O bus or

network. I/O adapters, network interface cards, and intelligent RAID controller module device I/O bus

control Application Specific Integrated Circuits (ASICs) are typical initiators. A peripheral device is a

target. (The Dictionary of Storage Networking Terminology)

Latency – The interval of time between submitting a request and receiving a response.

Multi Path I/O (MPIO) – In computer storage, an arrangement whereby more than one logical path

exists between the central processing unit (CPU) in a computer system and its storage devices. This

path is routed through the buses and bridge devices that connect the CPU and its storage devices. If

one RAID controller module, port, or switch fails, the operating system can route I/O through the

remaining RAID controller module so that work can continue.

Network interface card (NIC) – An adapter that connects an intelligent device to a network. The

common terminology is a network interface card or an Ethernet NIC network.

Node – An addressable entity connected to an input/output (I/O) bus or network and used primarily to

refer to computers, storage devices, and storage arrays. The component of a node that connects to the

bus or network is a port. (The Dictionary of Storage Networking Terminology).

Pass-through physical disk – An unformatted physical disk directly assigned to the virtual machine.

Portal – A service that links initiators and targets when their IP addresses are not known.

Quorum virtual disk –A virtual disk on the shared storage array that stores the quorum information.

Response time – The interval of time between submitting a request and receiving a response.

Session – A group of iSCSI connections. As each connection is established, the session can negotiate its

own unique parameters.

Signature – An embedded code that identifies the device. The signature is used when passing

information between devices.

Target – The storage destination. In this document, the target is the MD3200i storage array.

Throughput – The number of individual I/Os the storage array can process over time. Throughput is

measured in I/Os per second (IOPs).

Transmission Control Protocol/ Internet Protocol (TCP/IP) – A suite of protocols that includes

Transmission Control Protocol (TCP), Internet Protocol (IP), User Datagram Protocol (UDP), and Internet

Control Message Protocol (ICMP). These protocols form the basic set of communication protocols used

on the Internet. (The Dictionary of Storage Networking Terminology)

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