Veritas Storage Foundation 5.1 SP1 Advanced Features Administrator"s Guide (5900-1503, April 2011)

megabyte A measure of memory or storage. A megabyte is approximately 1,000,000 bytes
(technically, 2 to the 20th power, or 1,048,576 bytes). Also MB, Mbyte, mbyte, and
K-byte.
metadata Data that describes other data. Data dictionaries and repositories are examples
of metadata. The term may also refer to any file or database that holds information
about another database's structure, attributes, processing, or changes.
mirror A duplicate copy of a volume and the data therein (in the form of an ordered
collection of subdisks). Each mirror is one copy of the volume with which the
mirror is associated. The terms mirror and plex can be used synonymously.
mirroring A layout technique that mirrors the contents of a volume onto multiple plexes.
Each plex duplicates the data stored on the volume, but the plexes themselves
may have different layouts.
mount point The directory path name at which a file system attaches to the file system
hierarchy.
multithreaded Having multiple concurrent or pseudo-concurrent execution sequences. Used to
describe processes in computer systems. Multithreaded processes are one means
by which I/O request-intensive applications can use independent access to volumes
and disk arrays to increase I/O performance.
NBU See Veritas NetBackup (NBU).
node One of the hosts in a cluster.
object (VxVM) An entity that is defined to and recognized internally by the Veritas Volume
Manager. The VxVM objects include volumes, plexes, subdisks, disks, and disk
groups. There are two types of VxVM disk objects—one for the physical aspect of
the disk and the other for the logical aspect of the disk.
Online Transaction
Processing
See OLTP.
online administration An administrative feature that allows configuration changes without system or
database down time.
OnlineJFS The HP-UX name for the advanced Online Journaled File System, the full-featured
version of the Veritas File System.
OLTP (Online
Transaction Processing)
A type of system designed to support transaction-oriented applications. OLTP
systems are designed to respond immediately to user requests and each request
is considered to be a single transaction. Requests can involve adding, retrieving,
updating or removing data.
paging The transfer of program segments (pages) into and out of memory. Although
paging is the primary mechanism for virtual memory, excessive paging is not
desirable.
Glossary540