HP StorageWorks XP10000 Disk Array - Manual (Page 26)

By default, LUN security is disabled on each port. When you configure the system, you must enable LUN
security on each port to which hosts are connected.
For more information, see
Using LUN security .
Configuring LUs for use by RAID Manager XP
System administrators can enter RAID Manager XP commands from open-system hosts to perform
Continuous Access XP and Business Copy XP operations on logical devices. For example, administrators
can enter RAID Manager XP commands to create or split pairs. To allow administrators to use RAID
Manager XP commands, you must ensure that at least one logical device is used as a command device.
A command device receives RAID Manager XP commands entered from open-system hosts. When the
administrator enters a RAID Manager XP command from an open-system host, the RAID Manager XP
command is transferred via the command device to the target logical device.
To protect a logical device from RAID Manager XP commands, you must apply command device
security to the logical device. If command device security is applied to a logical device, the device is
not affected by RAID Manager XP commands even when commands are transferred via a command
device to that device.
For more information, see
Configuring arrays for using RAID Manager XP commands .
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.
26 Overview of LUN Manager