HP Hitachi Dynamic Link Manager Software User Manual
Page 483
B. Glossary
459
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
A function for distributing the load across all the paths that are accessing the logical
areas within an LU. To distribute the load, load balancing uses multiple paths to
perform I/O operations.
HDLM uses the following six algorithms for load balancing:
• The Round Robin algorithm
• The Extended Round Robin algorithm
• The Least I/Os algorithm
• The Extended Least I/Os algorithm
• The Least Blocks algorithm
• The Extended Least Blocks algorithm
LU (Logical Unit)
A logical unit that is a logical volume defined in the storage system, and with which
the host can perform input or output operations.
(See also: host LU)
N
node
A server in a cluster.
non-owner controller
A controller other than an owner controller.
Non-owner controllers exist only in the Thunder 9500V series, or Hitachi AMS/WMS
series.
(See also: owner controller, non-owner path)
non-owner path
A path that passes through a non-owner controller.
Non-owner paths exist only in the Thunder 9500V series, or Hitachi AMS/WMS
series.