Chaparral VFS113 - Manual (Page 88)

VFS113 Rack/Desktop Model User’s Guide
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Simple Network Management Protocol (SNMP) —SNMP is the Internet standard
protocol, defined in STD 15, RFC 1157, developed to manage nodes on an Internet
Protocol (IP) network.
Small computer system interface (SCSI) —SCSI is an industry standard for
connecting peripheral devices and their controllers to an initiator. Storage devices are
daisy-chained together and connected to a host adapter. The host adapter provides a shared
bus that attached peripherals use to pass data to and from the host system. Examples of
devices attached to the adapter include disk drives, CD-ROM discs, optical disks, and tape
drives. In theory, any SCSI device can be plugged into any SCSI controller.
Speed—Speed is a status type in the FC Status Menu that shows the speed (1,063 Mbps)
of the FC adapter.
Storage area network (SAN)—SAN refers to the network behind servers that links
one or more servers to one or more storage systems. Each storage system could be RAID,
tape backup, tape library, CD-ROM library, or JBOD. SANs operate with both SCSI and
networking (IP) protocols. Servers and workstations use the FC network for shared access
to the same storage device or system. Legacy SCSI systems are interfaced using an FC-to-
SCSI bridge.
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
EXTENDED COPY command).
Terminator block/termination—A terminator block (or termination) refers to the
electrical connection at each end of a SCSI bus. The terminator block is composed of a set
of resistors, or possibly other components. The function of a terminator block 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 68-pin high-density SCSI connector on the last SCSI peripheral. Data errors may
occur in a SCSI bus that is not terminated.
Topology—A network topology refers to the physical layout of nodes on a network.
Topologies range from local network topologies to WAN topologies. FC topologies
include point-to-point, FC-AL, and fabric.
Trap—In the context of SNMP, a trap is an unsolicited message sent by an agent to a
management station. The purpose is to notify the management station of some unusual
event.
Unkill—In Active-Active mode, when a surviving controller removes the reset from the
other controller, it unkills it. The other controller will reboot and attempt to come online.
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