Specifications

Glossary
This glossary includes terms for the IBM
TotalStorage Enterprise Storage Server (ESS) and
other Seascape solution products.
This glossary includes selected terms and
definitions from:
v The American National Standard Dictionary for
Information Systems, ANSI X3.172–1990,
copyright 1990 by the American National
Standards Institute (ANSI), 11 West 42nd
Street, New York, New York 10036. Definitions
derived from this book have the symbol (A)
after the definition.
v The Information Technology Vocabulary
developed by Subcommittee 1, Joint Technical
Committee 1, of the International Organization
for Standardization and the International
Electrotechnical Commission (SIO/IEC
JTC1/SC1). Definitions derived from this book
have the symbol (I) after the definition.
Definitions taken from draft international
standards, committee drafts, and working
papers being developed by ISO/IEC JTC1/SCI
have the symbol (T) after the definition,
indicating that final agreement has not been
reached among the participating National
Bodies of SCI.
This glossary uses the following cross-reference
form:
See This refers the reader to one of three
kinds of related information:
v A related term
v A term that is the expanded form of an
abbreviation or acronym
v A synonym or more preferred term
A
access. (1) To obtain the use of a computer resource.
(2) In computer security, a specific type of interaction
between a subject and an object that results in flow of
information from one to the other.
access-any mode. One of the two access modes that
can be set for the ESS during initial configuration. It
enables all fibre-channel-attached host systems with no
defined access profile to access all logical volumes on
the ESS. With a profile defined in ESS Specialist for a
particular host, that host has access only to volumes
that are assigned to the WWPN for that host. See
pseudo-host and worldwide port name.
active Copy Services server. The Copy Services
server that manages the Copy Services domain. Either
the primary or the backup Copy Services server can be
the active Copy Services server. The backup Copy
Services server is available to become the active Copy
Services server if the primary Copy Services server
fails. See backup Copy Services server and primary
Copy Services server.
alert. A message or log that a storage facility
generates as the result of error event collection and
analysis. An alert indicates that a service action is
required.
allegiance. In Enterprise Systems Architecture/390, a
relationship that is created between a device and one or
more channel paths during the processing of certain
conditions. See implicit allegiance, contingent
allegiance, and reserved allegiance.
allocated storage. On an ESS, the space allocated to
volumes, but not yet assigned. See assigned storage.
American National Standards Institute (ANSI). An
organization of producers, consumers, and general
interest groups that establishes the procedures by which
accredited organizations create and maintain voluntary
industry standards in the United States. (A)
Anonymous. The label in ESS Specialist on an icon
representing all connections using fibre-channel
adapters between the ESS and hosts that are not
completely defined to the ESS. See anonymous host,
pseudo-host, and access-any mode.
anonymous host. Synonym for “pseudo-host” (in
contrast to the Anonymous label that appears on some
pseudo-host icons. See Anonymous and pseudo-host.
ANSI. See American National Standards Institute.
APAR. See authorized program analysis report.
arbitrated loop. For fibre-channel connections, a
topology that enables the interconnection of a set of
nodes. See point-to-point connection and switched
fabric.
array. An ordered collection, or group, of physical
devices (disk drive modules) that are used to define
logical volumes or devices. More specifically, regarding
the ESS, an array is a group of disks designated by the
user to be managed by the RAID-5 technique. See
redundant array of inexpensive disks.
ASCII. American Standard Code for Information
Interchange. An ANSI standard (X3.4–1977) for
assignment of 7-bit numeric codes (plus 1 bit for parity)
to represent alphabetic and numeric characters and
© Copyright IBM Corp. 1999, 2001 185
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