Load Balancing - Hitachi XP P9500 User Manual

H
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 driver
A program that controls all the HDLM functions, manages paths, and detects errors.
host
An ESXi server that connects to storage subsystems via a SAN.
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.
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)
host LU number
A number assigned to a host LU. The host LU number is part of a path name.
(See also: host LU, path name)
I
intermittent error
An error that occurs irregularly due to, for example, a loose cable connection.
L
LDEV (Logical Device)
A combination of the storage system's product name, serial number, and an internal LU.
HDLM uses this value to identify a particular LU.

load balancing

Functionality for distributing the load across the paths that access each area within an
LU. To distribute loads, load balancing uses multiple paths to perform I/O operations.
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