Create Metro Mirror relationship — Select source volumes

Introduction

This page lists the available source volumes that are available to participate in Metro Mirror relationships determined by your selection of resource type and associated value on the main page. You have the option of changing the resource type from this page. The source volumes are selected from the storage complex (and storage unit and LSS, for example) that you have selected on the main page.

When volume pairs are established, the remote mirror and copy function copies data from the source volumes to the associated target volumes that you selected to participate in Metro Mirror relationships

Menu path

Fields

Resource type

The type of resource (LSS, Host, Volume group, Show All Volumes) from which to select volumes for remote mirror and copy functions. The value of the selection in this field will determine the field that is displayed to the right of this field. The default value for Resource type is LSS. The following resource type values and the respective field names that are displayed to its right:

• For LSS: Specify LSS
• For Host: Specify Host attachment
• For Volume Group: Specify Volume group
• For Show All Volumes: Specify Storage type

Specify LSS

The list of LSS identifiers that are available for selection. An LSS is a group of up to 256 logical volumes that have the same disk format, either count key data (CKD) for zSeries^® environments, or fixed block (FB) for open-system environments.

Specify Host attachment

The list of host attachment identifiers that are available for selection. A host attachment identifies the type of interface, such as Fibre Channel Arbitrated Loop (FC-AL), that is used to connect open-systems and zSeries hosts to invoke and manage remote mirror and copy functions.

Specify Volume group

The list of volume groups that are available for selection. A volume group, specified as a nickname, is a collection of logical volumes.

Show All volumes

"All FB Volumes" or "All CKD Volumes" that are available for selection.If "None selected" is selected, the table is empty.

For the zSeries servers, the data that is stored in a storage unit is arranged in a count-key-data (CKD) format. For the open system servers, the data that is stored in the storage unit is arranged in a fixed-block (FB) format.

Select

Check the select box to perform actions on specific table rows.

Nickname

The nickname of the source volumes that are part of the Metro Mirror relationship.

Volume Number

The volume number of the source volume, where the number is a 4-hexadecimal value that consists of the LSS number and the volume number. For example, LLVV, where LL is the LSS number and VV is the volume device number.

Volume Type

The type of data format for the source volumes: count-key-data or fixed block.

Binary (GB)

The capacity of DS volumes that are configured in binary format, where 1 GB (2³⁰) = 1 073 741 824 bytes.

Note: You must consider the gigabyte definitions. In many applications, the source and target volumes of a remote mirror and copy relationship must be exactly the same size. For example, if you plan to use DS6000™ and ESS 2105 volumes for remote mirror and copy functions, the volumes on the DS6000 must be created in decimal format to be compatible with ESS volumes.

Decimal (GB)

The capacity of ESS volumes that are configured in decimal format, where 1 GB (10⁹) = 1 000 000 000 bytes

Extent Pool

The nickname of the extent pool to which the volume is assigned.

Note: An extent is a contiguous range of storage on a physical storage unit, such as a rank or array that can be allocated to a logical volume. An extent pool is a logical collection of storage extents from one or more ranks that is used to create logical volumes. The extent pool number is a four-decimal digit number. Even numbered extent pools are associated with rank group 0. Odd numbered extent pools are associated with rank group 1.

Create paths

If you have not already created the path for the selected volume pair and you select this button, the Create paths wizard displays to allow you to create the path.