Metro Mirror Failover/Failback with Practice session properties

The properties are displayed on different tabs in the notebook. Use the Session Options tab to set properties that apply to the entire session or multiple role pairs in the session. Use the H2-I2 Options tab to set properties that apply to that role pair.

Session Options

Enter the properties for the session.

Description

Type the description for this session.

Reset Secondary Reserves

Select this option to remove any persistent reserves that might be set on the target volumes of the copy sets when a Start command is issued for the session.

Attention: This option causes the session to overwrite all data that is on the target volume.

Fail MM/GC if target is online (CKD only)

Select this option to fail any session commands for a Metro Mirror or Global Copy relationship if the target volume is in the Online state. For more information about this state, see the documentation for the storage system.

This option applies only to count key data (CKD) volumes.

Metro Mirror Suspend Policy

Select one of the following options to specify the policy for holding or releasing input/output (I/O) after a Metro Mirror relationship is suspended. When a relationship is in a Suspended state, write operations from the source volume are no longer mirrored to the target volume.

Hold I/O after Suspend

Click this option to prevent the source volume from receiving new data after the relationship is suspended. Use this option if you want to determine the scope of the suspension before new data is written to the source volume. This option helps to ensure that the data on the source and target volumes remains the same.

To enable write operations to the source volume to continue, issue the Copy Services Manager Release I/O command for the session. If you do not issue this command, write operations are enabled when the hardware timeout value on the storage system expires.

Release I/O after Suspend

Click this option to enable the source volume to automatically receive data after the relationship is suspended. Use this option if you want to limit the effect on the applications that are writing to the source volume. This option is enabled by default.

Attention: This option can cause the data on the source volume to be different from the data on target volume.

z/OS Management

Select the following options to manage IBM z/OS® features for the H1-I2 and H2-H1 role pairs.

The z/OS Management options are displayed only if Copy Services Manager is installed on or connected to a z/OS host system. You can add a z/OS host connection in Copy Services Manager regardless of the operating system on which the application is installed.

When you are connected to a z/OS host system, you can manage z/OS features for volumes that are attached to the host system. In addition, you can manage these features for volumes that are attached to other z/OS systems that are connected to the host system through a sysplex.

System or sysplex

Select the z/OS system or sysplex that you want to associate with the session. Commands for z/OS features are issued to this system or sysplex. Volumes in the session must be attached to the system or sysplex to enable the features.

Enable Hardened Freeze

Select this option to enable the z/OS Input/Output Supervisor (IOS) to manage freeze operations.

Requirement: This option requires the z/OS address spaces Basic HyperSwap® Management and Basic HyperSwap API. For instructions about how to start these address spaces, see the information about preparing to use Basic HyperSwap from z/OS in the IBM Copy Services Manager Installation and Configuration Guide.

If you select this option, IOS can freeze volumes regardless of whether the Copy Services Manager server is started or stopped.

In addition, with this option, you can include z/OS system volumes such as paging, database, and IBM WebSphere® Application Server hierarchical file system (HFS) as Metro Mirror volumes in the session. When you select this option, IOS manages the freeze operations for all Metro Mirror volumes in the session, which prevents Copy Services Manager from freezing the volumes and possibly freezing itself. This option does not enable IOS to manage freeze operations for Global Mirror volumes.

H2-I2 Options

Enter the properties for the role pair.

Persistent

Select this option to keep FlashCopy® pairs persistent on the hardware.

Incremental

Select this option to apply incremental changes to the target volume. After the initial FlashCopy operation, only data that changed on the source volume since the last FlashCopy operation completed is copied to the target volume. If the multiple incremental feature is supported on the storage system, it will be used. If you select this option, a persistent FlashCopy relationship is created regardless of whether you select the Persistent check box.

Reset target reserves (FB only)

Select this option to reset the SCSI reserves on the FlashCopy target volumes.

This option applies only to fixed block (FB) volumes.

Note: The SCSI reserves are reset only when the Flash command is issued, after the Reset target reserves (FB only) option is selected.