Service manual

Glossary
g-21
Glossary
redundancy Performancecharacteristic of a system or product whose integral
components are backed up by identical components to which
operations automatically failover after component failure.
Redundancy is a vital characteristic of high-availability computer
systems and networks.
remote notification The process by which a system informs remote users and
workstations of certain classes of events that occur. Call-home
notification, e-mail notification and configuration of SNMP trap
recipientsareexamples ofremotenotification programsimplemented
on directors and switches.
resource allocation
time-out value
The user-configured minimum time that a director or switch port
waits for Fibre Channel frame delivery through a switched fabric
before initiating the recovery process.
RFI See radio frequency interference.
RS-232 The Electronic Industry Association recommended specification for
asynchronous serial interfaces between computers and other
communications equipment. It specifies both the number of pins and
type of connection, but does not specify the electrical signals.
S
S/390 mode The management mode used to specify director or switch port
connectivity when the product is attached to an IBM System/390
(generation 5 or later) or zSeries 900 Parallel Enterprise Server with
one or more FICON channel cards installed. Contrast with
open-systems mode.
SAN See storage area network.
EFCM Basic Edition
interface
The EFCM Basic Edition interface provides a GUI similar to the
Element Manager application, and supports director or switch
configuration, statistics monitoring, and basic operation. With
director or switch firmware installed, administrators or operators
with a browser- capable PC and an Internet connection can monitor
and manage the director or switch through the interface. Formerly,
SANpilot interface.
SBAR See serial crossbar assembly.