HP XP20000 Bedienungsanleitung PDF herunterladen (Seite 27)

the external storage system can be displayed in a dialog box of XP External Storage when

you execute port discovery.

You can set in advance the mapping policy on whether to execute port discovery automatically

or manually. If port discovery is executed automatically, WWNs connected to all the external

ports of the local storage system will be searched for. If port discovery is executed manually,

you can select a specific external port and limit the scope to search WWNs. If you can specify

which external port to search for, you can reduce the operation time by executing the port

discovery manually.

• Volume discovery searches for and gets information about external volumes from the target

ports of the external storage system. Volume discovery is automatically executed after the port

discovery process.

When a port in an external storage system is connected to an XP storage system and has a

management LU (for example, Universal Xport LU), an extra operation is required. A management

LU is an LU that receives commands issued by a particular application. The management LU controls

or manages that application. The management LU stores control information from that application

and, therefore, the management LU cannot be used as an external volume. A command device is

not a management LU.

Before performing port discovery or volume discovery, perform one of the following operations on

the external storage system.

• Delete the management LU from the port connected to the XP storage system.

• Make sure that at least one LU is used for data storage and has a smaller LUN ID than the

LUN of the management LU. Also make sure that the data storage LU is set to the port connected

to the XP storage system.

• Use the security function and configure the access attribute of the management LU to prohibit

read and write operations.

If none of the operations is performed, an external storage system that has a management LU might

not be recognized by the local storage system.

Using a Mapped External Volume from a Connected Host

There are two ways of using the mapped external volume from a host that is connected the local

storage system.

• “Storing New Data in the Mapped External Volume” (page 27)

• “Using Existing Data in the Mapped External Volume” (page 28)

Storing New Data in the Mapped External Volume

To store new data in a mapped external volume from a host that is connected to the local storage

system:

1. Map the volume in the external storage system as an internal volume of the local storage

system using XP External Storage.

Select the emulation type of the mapped volume as you required. If you select the emulation

type for the open system (such as OPEN-V), go to step 2. If you select the emulation type for

the mainframe system (such as 3390-3), go to step 3.

For information on mapping operations, see “Mapping an External Volume Automatically”

(page 67).

2. If you set the emulation type for the open system when you map the volume, the status of the

mapped volume automatically becomes Normal. If you need to initialize the data area of the

mapped volume, format the volume using the VLL function. For the volume formatting procedure,

Using a Mapped External Volume from a Connected Host 27

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