McDATA Eclipse 2640 SAN, Administration And Configuration Manual

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Glossary g-55
Glossary
which the computer is connecting. The mask indicates which digits to
look at in a longer network address and allows the router to avoid
handling the entire address. Subnet masking allows routers to move
the packets more quickly. Typically, a subnet may represent all the
machines at one geographic location, in one building, or on the same
local area network.
switch
A device that connects, filters and forwards packets between local
area network (LAN) segments or storage area network (SAN) nodes
or devices.
switched mode
If the arbitrated loop device is in switched mode, each pair of
communicating ports on the arbitrated loop device can share the
100MB bandwidth. In switched mode, up to three pairs of loop
devices can communicate with each other simultaneously. Or, a
public device on the loop can communicate with another device on
the fabric while up to two pairs of loop devices can communicate
simultaneously.
switchover
Changing a backup field-replaceable unit (FRU) to the active state,
and the active FRU to the backup state.
switch priority
Value configured into each switch in a fabric that determines its
relative likelihood of becoming the fabric’s principal switch. Lower
values indicate higher likelihood of becoming the principal switch. A
value of 1 indicates the highest priority; 225 is the lowest priority. A
value of 225 indicates that the switch is not capable of acting as the
principal switch. The value 0 is illegal.
synchronous optical
network
SONET. A standard for optical network elements. Basic level is 51.840
megabit/second (OC-1); higher levels are
n
times the basic rate
(OC-
n
).
System Automation for
Operating System/390
SA OS/390™. IBM licensed software that provides System/390
Parallel Sysplex™ management, automation capabilities, and
integrated systems and network management. SA OS/390 manages
host, remote processor, and I/O operations. SA OS/390 integrates the
functions of Automated Operations Control for Multiple Virtual
Storage (MVS™), ESCON™ Manager, and Target System Control
Facility
(D)
.
system name See
product name .