Create volume group — Define volume group properties

Use this page to change the nickname that you or the system has assigned to the volume group and or define properties for the volume group.

Introduction

The Define volume group properties page is the first page of the Create volume group wizard. This page allows you to create or change the nickname that is associated with the volume group. This page also allows you to designate the host types that can access the volume group.

There are 2 host type choices that are based on the address discovery method that the system uses to determine the types of volumes that are associated with the volume group.

Map 256: Specifies a set of logical volume numbers as a list of 2-byte logical volume numbers. The configured logical volumes have consecutive locations in the list starting from the beginning. You can specify a maximum of 256 logical volumes (512 bytes).
Mask: Specifies a set of logical volume numbers as a bitmap with one bit per logical volume number. A maximum of 65 280 (63.75 KB) logical volumes can be specified (8 KB).

Note: The changes and selections made on this page are not committed until you go through the entire wizard process. However, before you can move to the next page of the wizard, you must ensure that you have a valid volume group nickname and that you have selected a host type.

Menu path

Real-time manager or Simulated manager > Configure storage > Open systems > Volume groups > Select Action: Create... > Go

Fields

Nickname

Specifies the unique nickname that you or the system assign to the volume group. It is limited to 16 characters.

Accessed by host types

When you make the first selection in the table, the table updates to show all compatible host types as selected with regard to block size and addressing method. (For example, when you select a host type that has an addressing method of Map 256, all the host types with Map 256 are automatically selected.)

Select: Provides the selection method (a check box) for specifying the host types that you want to allow access to the volume group. When you select a host type with an addressing method of Map 256, all the host types that use a Map 256 addressing method are automatically selected. When you select a host type with an addressing method of Mask, all the host types that use a Mask addressing method are automatically selected.
Host Type: Specifies the host type abbreviation.
Block Size: Specifies the block size, 512 or 520.
Addressing Method: Specifies the addressing method, Mask or Map 256 that the system uses to identify the LUNs that are accessible by the host port.