Load Balancing - Hitachi XP P9500 User Manual

D. Glossary
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)
hypervisor
Software that enables host virtualization.
intermittent error
An error that occurs irregularly due to, for example, a loose cable connection.
IP-SAN (Internet Protocol - Storage Area Network)
A data transfer network that connects hosts and storage systems by using the iSCSI
standard.
KVM (Kernel-based Virtual Machine)
A mechanism that uses the Linux kernel itself as a hypervisor. KVM uses QEMU to
control guest OSs.
(See also: QEMU)
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.
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
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