Overland Storage SnapSAN S1000 User Manual page 128

SnapSAN S1000 User Guide
Stripe Size
This is the number of data drives multiplied by the chunk size.
Sub-array
In RAID 50 applications, this is the name given to the individual RAID 5 arrays that are
striped together. Each sub-array has one parity drive.
Target
A target is a device (peripheral) that responds to an operation requested by an initiator (host
system). Although peripherals are generally targets, a peripheral may be required to act
temporarily as an initiator for some commands (for example, SCSI COPY command).
Targets are embedded in iSCSI storage controllers. They are the software that makes the
RAID storage available to host computers, making it appear just like any other sort of disk
drive.
TCP/IP
Short for Transmission Control Protocol/Internet Protocol. The basic protocol used for data
transmission over the Internet.
Telco
Short for Telephone Company. When used in reference to a rack, it refers to the two-posted,
light-weight rack for center-mounted appliances.
Telnet
A terminal emulation program for TCP/IP networks such as the Internet. The Telnet
program runs on a computer and connects it to a server on the network. You enter
commands through the Telnet program and they will be executed as if you were entering
them directly on the server console. This enables you to control the server and communicate
with other servers on the network. To start a Telnet session, you must log in to a server by
entering a valid user name and password. Telnet is a common way to remotely control Web
servers.
Terminator
A terminator refers to the electrical connection at each end of a SCSI bus. The terminator is
composed of a set of resisters, or possibly other components. The function of a terminator is
to provide a pull-up for open collector drivers on the bus, and also impedance matching to
prevent signal reflections at the ends of the cable. SCSI buses require that a terminator be
placed on the SCSI connector on the last SCSI peripheral. Data errors may occur in a SCSI
bus that is not terminated.
TOE (TCP Offload Engine)
Short for TCP Offload Engine. TOE is a technology used in network interface cards to offload
processing of the entire TCP/IP stack to the network controller. It is primarily used with
high-speed network interfaces, such as gigabit Ethernet and 10 gigabit Ethernet, where
processing overhead of the network stack becomes significant.
Topology
Logical layout of the parts of a computer system or network and their interconnections.
There are two types of topology: physical and logical. The physical topology of a network
refers to the configuration of cables, computers, and other peripherals. Logical topology is
the method used to pass the information between workstations.
10400310-003 01/2013
©2010-13 Overland Storage, Inc.
Glossary
GL-13
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