Metro Mirror - Metro Mirror with Site 4 Replication session properties

Edit online

Use the View/Modify Properties notebook to edit properties for IBM® DS8000® Metro Mirror - Metro Mirror with Site 4 Replication sessions.

If the copy services management server is installed on or connected to a z/OS® host system, the properties are displayed on different tabs in the notebook. Use the Session Options tab to set properties that apply to the entire session. Use the individual role pair option tabs to set z/OS management properties that apply to specific role pairs. For example, properties for the H1-H2 role pair are contained in the H1-H2 Options tab. Use the HyperSwap® Options tab to set properties for managing HyperSwap operations for the session.

If the copy services management server is not installed on or connected to a z/OS host system, only the Session Options tab is displayed.

Session Options

Enter the properties for the session.

Description

Type the description for this session.

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, refer to the documentation for the storage system.

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

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.

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.

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.

If you select No Association, the options that are on the remaining tabs in the notebook are unavailable. This option is displayed only if the copy services management server is installed on or connected to a z/OS host system.

H1-H2 Options, H1-H3 Options, H2-H3 Options, H3-H4 Options and H1-H4 Options

Enter the properties for the role pair.

Manage Hx-Hx with HyperSwap: Select this option to trigger a HyperSwap operation, which redirects application I/O to the target volumes when there is a failure on the host accessible volumes. HyperSwap is used to manage the H1-H2, H1-H3, or H3-H2 sequence of the session.

HyperSwap options

Enter the HyperSwap properties for the role pairs that are in the session. If you select Manage Hx-Hx with HyperSwap on the H1-H2 Options, H1-H3 Options, or H2-H3 Options tab, these properties define how HyperSwap Manager determines the target site for the HyperSwap operation, the priority for target sites, and the process that occurs in the event of an error during the operation.

Disable HyperSwap: Select this option to prevent a HyperSwap operation from occurring.

Reset In Use By System on Secondary Volumes: Select this option to have the load of the configuration automatically reset the In Use By System state on all secondary volumes (UCBNALOC = OFF). When this option is not selected, a load of the configuration fails when secondary volumes are in the In Use By System state (UCBNALOC is ON). This feature is only available after APAR OA53082 is applied to the z/OS system.
Unbox Secondary Volumes: Select this option to have the load of the configuration automatically unbox all secondary volumes in the configuration. When this option is not selected, a load of the configuration fails when secondary volumes are in a boxed state. This feature is only available after APAR OA53082 is applied to the z/OS system.

On Planned HyperSwap error:: Partition out the failing system(s) and continue swap processing on the remaining system(s)
Select this option to partition out the failing system and continue the swap processing on any remaining systems.; Disable HyperSwap after attempting backout
Select this option to enable IOS to back out the HyperSwap operation, if possible, if an error occurs during HyperSwap processing. HyperSwap is disabled.

On Unplanned HyperSwap error:

Partition out the failing system(s) and continue swap processing on the remaining system(s)

Select this option to partition out the failing systems and continue HyperSwap processing on the remaining systems when a new system is added to the sysplex and the HyperSwap operation does not complete.

Requirement: If you select this option, you must restart the system.

Disable HyperSwap after attempting backout

Select this option to enable IOS to back out the HyperSwap operation, if possible, if an error occurs during HyperSwap processing. HyperSwap is disabled.

HyperSwap Site Selection

Select one of the following options to specify how HyperSwap Manager selects the target site for a HyperSwap operation.

Allow HyperSwap Manager to determine the HyperSwap site: Select this option to enable HyperSwap to select the target site for a HyperSwap operation.; HyperSwap Manager selects the target site that keeps the most sysplex members active. If multiple target sites are equal candidates for the HyperSwap operation, HyperSwap Manager uses the Site HyperSwap Priorities value to select the target site. For example, if both site 1 and site 3 are equal, but the Site HyperSwap Priorities priority is site 3, site 2, and site 1, HyperSwap Manager selects site 3.
Determine the HyperSwap site by specified priorities: Select this option to direct HyperSwap Manager to select the target site based on the priority list that is specified by the Site HyperSwap Priorities option.

HyperSwap Site Priorities

Specify the priority in which HyperSwap Manager selects the target site for a HyperSwap operation.

The default value priority is site 1, site 2, and site 3. This order indicates that the first priority is site 1, the second priority is site 2, and the third priority is site 3. If site 1 is the active site, then site 1 is ignored and HyperSwap Manager selects site 2 or 3 depending on the load status and availability of the sites, with site 2 being the preferred site.

If you select Allow HyperSwap Manager to determine the HyperSwap site, this option is used only when multiple target sites are equal candidates for a HyperSwap operation.

If you select Determine the HyperSwap site by specified priorities, this option determines the order in which HyperSwap Manager selects the target site.