System information

Glossary
g-39
Glossary
megabyte MB. A unit of measure for data storage, equal to 1,048,576 bytes.
Generally approximated as one million bytes.
memory A device or storage system capable of storing and retrieving data.
menu A list of items displayed on a monitor from which a user can make a
selection.
menu bar The menu bar is located across the top of a monitor window.
Pull-down menus are displayed by clicking on the menu bar option
with the mouse, or by pressing Alt with the underlined letter of the
name for the menu bar option (D).
message path
controller card
MPC card. In the ED-5000 Director, a card that provides the
mechanism for messages to be sent and received between ports on
the director. The card also provides a system clock source, and central
control and distribution of clocks for MPC, G_Port module (GPM),
and central memory module (CMM) cards. See also
Fibre Channel I/O
controller.
metropolitan area
network
MAN. A network capable of high-speed communications over
distances up to about 100 kilometers. See also
local area network;
metro-area storage area network (mSAN); wide area network.
metropolitan storage
name server (mSNS)
The SAN Router’s metro storage name server (mSNS) stores the
inventory of hosts and storage devices in the mSAN, as well as
zoning information, to specify which hosts can use which storage
devices.
MIB See management information base.
mirroring The writing of data to pairs of drives in an array, creating two exact
copies of the drive contents. This procedure provides a backup of
data in case of a failure.
modem Modem is an abbreviation for modulator/demodulator. A
communication device that converts digital computer data to signals
and signals to computer data. These signals can be received or
transmitted by the modem via a phone line or other method of
telecommunication.
ms Millisecond.