Create Metro Mirror relationship — Select target volumes (auto pairing)

Introduction

This page displays only if you selected the Automated volume pair assignment option. From the list of available target volumes, the system will later automatically select target volumes of the same size as the source volume. The volume pairs display in sequential numbering fashion. For example, the lowest source volume number is paired with the lowest target volume ID, and so on.

Menu path

Fields

Storage complex

The nicknames of storage complexes that are available for selection. If you want to use target volumes from another storage complex, you can specify a different storage complex (and storage unit and LSS, for example) from which to select target volumes.

A storage complex describes a group of storage units such as the DS6000™ that is managed by a single management console.

Note: Nicknames are user-specified when resources are created and can be used as part of an overall scheme or naming convention for making resources easier to identify and manage.

Storage unit

The nicknames of storage units that are available for selection. This list can include any nickname that is associated with any 2107, 1750, and 2105 Model 800 currently displayed in the Storage units main page. A storage unit consists of a single DS6000.

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 determines 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 display to its right when selected:

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

Select the target volumes that you select to participate in Metro Mirror relationships.

Select

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

Nickname

The nickname that identifies the target volume.

Volume Number

The volume number (or name, such as 1E2C) that identifies the target volume, where the number is a four-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 number.

Binary (GB)

The size, in gigabytes, of the DS target volumes that are available for selection. DS volumes 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 size, in gigabytes, of the ESS target volumes that are available for selection. ESS volumes 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.

Host Attachments

The quantity of host attachments that are associated with the selected target volumes.