HiCommand Dynamic Link Manager (HDLM) for Windows Systems User's Guide (HIT5201-96001, January 2008)

386 Glossary
Universal Storage Platform V, all controllers
are owner controllers.
owner path A path that provides the fastest access to an
LU, using an owner controller. When using
the Thunder 9200, or Thunder 9500V Series,
the access speed to the LU varies depending
on the path. A path that provides slower LU
accesses than the owner path is called a non-
owner path.When using the TagmaStore USP,
Lightning 9900V Series, and Lightning 9900
Series, TagmaStore USP, or Universal Storage
Platform V, all paths are owner paths.
path An access path from a host to storage
system. Access to a logical area within an LU
in a storage system is made via a cable
connecting the host bus adapter on the host
and the channel adapter on the storage
system. Each path has an AutoPATH_ID.
path health checking Functionality for checking the status of paths
at regular intervals. When an error occurs at
a path that was in the Online status, path
health checking changes the status of the
path to the Offline(E) status. Path health
checking checks only those paths that have
Online status.
path name The name of a path, which consists of the
following four hexadecimal items, separated
by periods: a host port number, a bus
number, a target ID, and a host LU number.
persistent reservation Similar to reservation, persistent reservation
enables a host to declare that it has
exclusive use of an LU, and prevents other
hosts from accessing that LU. While
reservation allows a host to have exclusive
use of only one path to the LU, persistent
reservation allows a host to have exclusive
use of multiple paths. If HDLM applies
persistent reservation, a host can have
exclusive use of multiple paths to an LU,
thus enabling load balancing among these
exclusively used paths.
physical path An access path from a host to an LU. A path
name is used to identify a physical path.
Remove LU Functionality to delete LU from an HDLM