HP XP Racks - Manual (Page 491)

failover
A function for switching to another normal path if there is an error in the current access
path, thereby enabling the system to continue to operate.
H
HAM environment
An environment in which volume pairs that are synchronized between two storage
systems are created by HAM (High Availability Manager), and hosts are configured to
recognize these volumes as one volume. An HAM environment consists of the primary
volume (P-VOL) in the primary site and the secondary volume (S-VOL) in the secondary
site. When an error occurs on one of the volumes, the path can be switched to the other
volume by using HDLM.
HBA (Host Bus Adapter)
Device that functions as an interface connecting a host with external devices.
In this manual, the term HBA refers to an interface card installed in a host, in
configurations where the host and storage units are connected via a FC connection.
HDLM alert driver
A program that receives information about an error detected by the HDLM driver, and
then reports the error information to the HDLM manager.
HDLM driver
A program that controls all the HDLM functions, manages paths, and detects errors.
HDLM manager
A program that manages error information. The HDLM manager receives error
information from the HDLM alert driver and then collects error logs.
host
A generic term for both servers and clients.
host device
A logical area in a host LU.
(See also: host LU, host device name)
host device name
A name assigned to a host device. The hdisk is assigned.
(See also: host device)
host LU
An LU that a host recognizes. The actual HDev entity is a Dev in the storage system.
Each host LU has a host LU number.
(See also: LU, host LU number, host device)
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Glossary-3
Hitachi Dynamic Link Manager (for AIX) User Guide