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

HiCommand
®
Dynamic Link Manager (HDLM) for Windows
®
Systems User’s Guide 385
host device name A logical area within a host LU.
host LU An LU that the host recognizes. The actual
HDev entity is a dev in the storage system.
Each host LU has a host LU number.
host LU number A number assigned to a host LU. The host LU
number is part of a path name.
IP-SAN (Internet protocol - storage area
network)
A data transfer network that connects hosts
and storage systems using the iSCSI standard.
LDEV (logical device) The value that identifies an LDEV consists of
a combination of the storage system's
product name, serial number, and internal
LU. HDLM uses this value to identify an LU.
load balancing Functionality for distributing the load across
the paths that access each logical area
within an LU. To distribute loads, load
balancing uses multiple paths to perform I/O
operations. Two types of algorithms are
available: round-robin and extended round-
robin.
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.
node A server of cluster members.
non-owner controller A controller that provides slower LU accesses
than an owner controller. Non-owner
controllers exist only when Thunder 9200 or
Thunder 9500V Series are in use.
non-owner path A path that provides slower LU accesses than
an owner path. Non-owner paths use a non-
owner controller. Non-owner paths exist only
when Thunder 9200, or Thunder 9500V Series
are in use.
owner controller A controller that provides the fastest access
to an LU. When using the Thunder 9200, or
Thunder 9500V Series, the access speed to
the LU varies depending on the controller. A
controller that provides slower LU access
than an owner controller is called a non-
owner controller. When using the
TagmaStore USP, Lightning 9900V Series, or
Lightning 9900 Series, TagmaStore USP, or