SVS200 LUN Manager and Volume Manager (T1714-96015, October 2007)

By default, LUN security is disabled on each port. When you conﬁgurethesystem,youmustenableLUN

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 Acc

ess 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 t

hat device.

For more information, see Conﬁguring arrays for using RAID Manager XP commands.

NOTE:

You cannot use the following volumes as command devices:

• Volumes th

at 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 v

olumes

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:Thesimplestﬁbre topology directly connects two devices together.

Overview of LUN Manager