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

2 Chapter 1 Overview of HDLM
1.1 What is HDLM?
The widespread use of data warehousing and increasing use of multimedia data have
increased the need for high-speed processing of large volumes of data on networks. To
satisfy this need, networks dedicated to data transfer, such as a SAN, are now being used to
provide access to storage systems.
The HDLM software manages access paths to storage systems. HDLM provides functionality
for distributing the load across paths and switching to another path if there is a failure in a
path being used, thus improving system availability and reliability.
Figure 1.1 illustrates the connections between hosts and storage systems. A server on which
HDLM is installed is called a host.
Figure 1.1 Connections Between Hosts and Storage Systems
HDLM supports the following storage systems:
 TagmaStore USP
 Universal Storage Platform V
 TagmaStore AMS/WMS series
 Lightning 9900V Series
 Lightning 9900 Series
 Thunder 9500V Series
 Thunder 9200
 EMC DMX series