Modify zSeries volume — Define alias assignments

Introduction

This page is displayed when you specify an LCU that results in a volume creation.

Menu path

Fields

For volumes created in a specified LCU

LCU

The logical control unit, based on user selection (00 to FF).

Available addresses

The quantity of available addresses in the LCU (0 to 256).

Select

Select the appropriate check boxes.

Volume Number

The volume number (for example, 1E3B).

Nickname

The user-defined nickname.

Volume Type

The volume type (3380 Mod 2, 3380 Mod 3, 3390 Mod 3, 3390 Mod 9, or Custom 3390).

Capacity

The capacity in cylinders.

Aliases: Bases

The quantity of aliases for this base volume.

Starting address

The starting address is the first available number that is assigned to an alias volume by the system as part of the allocation policy. You can request any address between 0 and 255. The number of aliases that you request determines the number of generated addresses. You can also specify whether you want the selection of available addresses to occur in ascending or descending order. Only unique and available addresses are assigned, and the numbers wrap in the specified order to generate the closest series of numbers that are based on the requested starting address and the first available number.

For example, if you enter the starting address of 250, specify ascending order, and request 6 aliases, the addresses that you receive will be 250, 251, 252, 253, 254, and 255, if they are available. If address 255 were not available, the numbering sequence wraps to zero and assigns the next available address in an ascending order. If address 255 were available, the address becomes 0. If you enter the starting address of 5, specify descending order, and request 6 aliases, the addresses that you receive will be 5, 4, 3, 2, 1, and 0, if they are available. If address 0 were not available, the numbering sequence wraps to 255 and assigns the next available address in a descending order. If address 0 were available, the address becomes 255.

Ascending/ Descending (optional)

If you defined a default in the address allocation policy, that value is displayed here as the default.

Aliases

The quantity of Aliases per selected volumes. This value is a function of the available addresses for the selected LCU. You can enter a decimal value here to represent fractions of the number of aliases per volume. For example:

• A value of 0.25 indicates 1 alias to every 4 base volumes
• A value of 1 indicates 1 alias to every 1 base volume

Per Volumes

The quantity of aliases per volume. A valid value is a function of the available addresses for the selected LCU.

Add aliases

Required if the value in the Aliases Per Volumes fields is greater than zero. For all of the aliases created, you must select the Add Aliases button in order to proceed in the wizard. When you have added the alias, you can add more aliases by inputting another value in the Aliases Per Volumes fields and selecting more volumes, or by keeping the same value and just selecting the button again. You can repeat this task until you are satisfied with the alias assignments.

Note: If you want to add aliases, the number of base volumes must be greater than 0.

For volumes created in non-specified LCUs

Quantity of LCUs

The user-defined quantity of LCUs for the volumes being created.

Select

The check boxes that are associated with the LCUs.

LCU Number

The logical control unit number (00 to FF).

Volume Quantity

The quantity of volumes to be created in this LCU

Available Addresses

The quantity of available addresses in the LCU (0 to 254).

Starting address

A starting address that is common to all the LCUs selected from the table. If no starting address is common to all the selected LCUs, the starting address is determined by the application for each LCU.

Ascending/ Descending

A value defined in the address allocation policy is the default here.

Aliases

The quantity of aliases per selected volumes. This value is a function the available addresses for the selected LCU. You can enter a decimal value here to represent fractions of the number of aliases per volume. For example:

• A value of 0.25 indicates 1 alias to every 4 base volumes
• A value of 1 indicates 1 alias to every 1 base volume

Per Volumes

The quantity of aliases per volume. A valid value is a function of the available addresses for the selected LCU.

Add aliases

Required if the value in the Aliases Per Volumes fields is greater than zero. For all of the aliases created, you must select the Add Aliases button in order to proceed in the wizard. When you have added the alias, you can add more aliases by inputting another value in the Aliases Per Volumes fields and selecting more volumes, or by keeping the same value and just selecting the button again. You can repeat this task until you are satisfied with the alias assignments.

Note: If you want to add aliases, the number of base volumes must be greater than 0.