VERITAS Storage Foundation 4.1 Oracle Administrator's Guide

Prerelease 8 September 2005, 8:55am
528 VERITAS Storage Foundation for Oracle Administrator’s Guide
latency
The amount of time it takes for a given piece of work to be completed. For file systems, this
typically refers to the amount of time it takes a given file system operation to return to the user.
Also commonly used to describe disk seek times.
load balancing
The tuning of a computer system, network tuning, or disk subsystem in order to more evenly
distribute the data and/or processing across available resources. For example, in clustering, load
balancing might distribute the incoming transactions evenly to all servers, or it might redirect them
to the next available server.
load sharing
The division of a task among several components without any attempt to equalize each
component’s share of the load. When several components are load sharing, it is possible for some
of the shared components to be operating at full capacity and limiting performance, while others
components are under utilized.
Logical Unit Number
A method of expanding the number of SCSI devices that can be placed on one SCSI bus. Logical
Unit Numbers address up to seven devices at each SCSI ID on an 8-bit bus or up to 15 devices at
each ID on a 16-bit bus.
logical volume
See “volume.”
LUN
See “Logical Unit Number.”
master node
A computer which controls another computer or a peripheral.
megabyte
One million bytes, or more precisely 1,048,576 bytes. Also MB, Mbyte and M-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.