HP StorageWorks XP LUN Configuration and Security Manager User Guide: HP XP12000 Disk Array HP XP10000 Disk Array HP 200 Storage Virtualization System (T1714-96030, June 2010)

NOTE:
You cannot use the following volumes as command devices:
• Volumes that do not have the Read/Write access attribute
• Volumes reserved by Auto LUN XP
• Continuous Access XP volumes
• Business Copy XP volumes
• External LUs
• Volumes on which a VMA is set
• Virtual volumes
Fibre Channel ports
When configuring Fibre Channel environments, you must configure the Fibre Channel topology and
set addresses to the Fibre Channel ports.
You can optimize system performance by adjusting settings for the Fibre Channel ports. You can
improve system performance by adjusting the data transfer speed at Fibre Channel ports and changing
the channel adapter mode.
Fibre Channel topologies
The term topology indicates how devices are connected to each other. Fibre Channel provides the
following topologies:
• Fabric: Uses a fabric switch to connect a large number of devices (up to 16 million) together. Each
device has the full bandwidth of 100 MB/sec.
• FC-AL (Fibre Channel-Arbitrated Loop): A shared interface that can connect up to 126 devices (AL-
ports) together. The 100 MB/sec bandwidth is shared among devices connected to each other.
• Point-to-point: The simplest fibre topology directly connects two devices together.
Overview of XP LUN Configuration and Security Manager Software26