What Is Hdlm - Hitachi XP P9500 User Manual

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 uses
MPIO functionality supported by AIX 5L V5.2 or later.
HDLM, as an extended module of MPIO, 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 Connections between hosts and storage systems on page 1-2
illustrates the connections between hosts and storage systems. A server on
which HDLM is installed is called a host.
HDLM supports the following storage systems.
• Hitachi AMS2000/AMS/WMS/SMS series
• Hitachi USP
• Thunder 9500V series
• Lightning 9900V series
• Universal Storage Platform V/VM
• Virtual Storage Platform
1-2
Figure 1-1 Connections between hosts and storage systems
Overview of HDLM
Hitachi Dynamic Link Manager User Guide (for AIX(R))