SVS200 (T1714-96008, June 2006)

LUN Configuration and Security Manager XP user guide for the XP12000/XP10000/SVS200 25

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” on page 97.

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.