Compaq StorageWorks HSG60 ACS Solution Software V8.6 for Compaq Tru64 UNIX Installation and Configuration Guide

Glossary–11
metadata The data written to a disk for the purposes of controller administration.
Metadata improves error detection and media defect management for the disk
drive. It is also used to support storageset configuration and partitioning.
Nontransportable disks also contain metadata to indicate they are uniquely
configured for StorageWorks environments. Metadata can be thought of as
“data about data.”
mirroring The act of creating an exact copy or image of data.
mirrored
write-back caching
A method of caching data that maintains two copies of the cached data. The
copy is available if either cache module fails.
mirrorset See RAID level 1.
MIST Module Integrity Self-Test.
N_port A port attached to a node for use with point-to-point topology or fabric
topology.
NL_port A port attached to a node for use in all topologies.
network In data communication, a configuration in which two or more terminals or
devices are connected to enable information transfer.
node In data communications, the point at which one or more functional units
connect transmission lines.
Non-L_Port A Node of Fabric port that is not capable of performing the Arbitrated Loop
functions and protocols. N_Ports and F_Ports loop-capable ports.
non-participating
mode
A mode within an L_Port that inhibits the port from participating in loop
activities. L_Ports in this mode continue to retransmit received transmission
words but are not permitted to arbitrate or originate frames. An L_Port in
non-participating mode may or may not have an AL_PA. See also
participating mode.
nominal
membership
The desired number of mirrorset members when the mirrorset is fully
populated with active devices. If a member is removed from a mirrorset, the
actual number of members may fall below the “nominal” membership.
node In data communications, the point at which one or more functional units
connect transmission lines. In Fibre Channel, a device that has at least one
N_Port or NL_Port.