HP StorageWorks XP Remote Web Console Software - Manual (Page 7)

2 About LUN Manager Operations
This chapter provides an introduction to Fibre Channel operations, LUN Security, and HP RAID
Manager.
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Overview of LUN Manager Operations
The HP storage system can be connected to open-system server hosts of different platforms (for
example, UNIX servers and PC servers). To configure a system that includes open-system hosts and
a storage system, you must use LUN Manager to configure logical volumes and ports. Throughout
this manual, logical volumes are sometimes referred to as LDEVs.
One of the important tasks with logical volume configuration is to define I/O paths from hosts to
logical volumes. If the paths are defined, the hosts can send commands and data to the logical
volumes and receive data from the logical volumes.
After the system begins operating, you might need to modify the system configuration. For example,
if hosts or disks are added, you will need to add I/O paths. Even when the system is operating,
you can modify the system configuration with LUN Manager. You do not need to reboot the system
when changing the system configuration.
Use LUN Manager to make various settings with LUs. The settings include the LU path settings.
When you configure a system, you must define LU paths to let the hosts transfer data to and from
storage.
It is necessary to change the mode of the HP XP Remote Web Console main window to the Modify
mode to do various settings with LUN Manager. When the background color of the icon on the
right of the window is light yellow ( ), the window is in the Modify mode. When the background
color is gray ( ), it is in the View mode. If you click the ( ) icon when the Unlocked icon (
) is displayed, the icon changes to ( ) and the mode is changed to the Modify mode. For details
on how to change to the Modify mode, see HP XP24000/XP20000 Remote Web Console User
Guide.
CAUTION: When you define the LU paths, you must not use RAID Manager and Remote Web
Console at the same time.
Overview of Fibre Channel Operations
After open-system hosts and the storage system are physically connected by cables, hubs, and so
on, you must use LUN Manager to establish I/O paths between the hosts and the logical volumes.
This defines which host is able to access which logical volume. Logical volumes that can be accessed
by open-system hosts are referred to as logical units (LUs). The paths between the open-system
hosts and the LUs are referred to as LU paths.
Before defining LU paths, you must classify server hosts by host groups. For example, if Linux hosts
and Windows hosts are connected to the storage system, you must create one host group for the
Linux hosts and another host group for the Windows hosts. Then, you must register the host bus
adapters of the Linux hosts in the Linux host group. You must also register the host bus adapters of
the Windows hosts in the Windows host group.
A host group can only contain hosts that are connected to the same port, and cannot contain hosts
that are connected to different ports. For example, if two Windows hosts are connected to port
Overview of LUN Manager Operations 7