Session types

HyperSwap

HyperSwap® is a copy services solution for IBM® z/OS® version 1.9 and later. HyperSwap provides high availability of data if a storage system failure occurs. If an I/O error occurs at the primary site, HyperSwap technology automatically swaps I/O to a secondary set of volumes with little to no impact to the customer.

FlashCopy

FlashCopy® replication creates a point-in-time copy of the data on a source volume to a target volume. Data that existed on the target volume is replaced by the copied data.

Snapshot

Snapshot replication creates a point-in-time copy of a volume or set of volumes without having to define a specific target volume. The target volumes of a Snapshot session are automatically created when the snapshot is created.

Metro Mirror Single Direction

Metro Mirror is synchronous replication that operates between two sites that are up to 300 km apart. The source volumes are on one storage system and the target volumes are on another storage system.

Metro Mirror replication maintains identical data in both the source and target volumes. When a write operation is issued to a source volume, the changes are propagated to the target volume before the write operation finishes processing.

With the Metro Mirror Single Direction session type, Metro Mirror replication is available only from the primary site.

Metro Mirror Single Direction sessions are available for the following Copy Services Manager editions and storage systems.

Metro Mirror Single Direction

Metro Mirror Failover/Failback

With Metro Mirror Failover/Failback replication, you can switch the direction of the data flow so that you can use your secondary site as your production site. You can then copy changes that are made at the secondary site back to the primary site.

Metro Mirror Failover/Failback sessions are available for the following Copy Services Manager editions and storage systems.

Metro Mirror Failover/Failback with Practice

Metro Mirror Failover/Failback with Practice replication combines Metro Mirror Failover/Failback and FlashCopy capabilities to provide a point-in-time copy of the data on the secondary site. This session type provides volumes that you can use to practice for disaster recovery without losing your disaster recovery capability.

Metro Mirror Failover/Failback with Practice sessions are available for the following Copy Services Manager editions and storage systems.

Metro Mirror Failover/Failback with Change Volumes

Metro Mirror Failover/Failback with Change Volumes replication provides the same capabilities as the Metro Mirror Failover/Failback session type. However, Metro Mirror Failover/Failback with Change Volumes sessions also associate change volumes to the primary and secondary to enable consistency protection during restarts.

Metro Mirror Failover/Failback with Change Volumes sessions are available for the following Copy Services Manager editions and storage systems.

Global Mirror Single Direction

Global Mirror is asynchronous replication that operates between two sites that are over 300 km apart. The source volumes are on one storage system and the target volumes are on another storage system.

Global Mirror replication maintains identical data in both the source and target volumes. When a write operation is issued to a source volume, the changes are typically propagated to the target volume a few seconds after the data is written to the source volume.

With the Global Mirror Single Direction session type, Global Mirror replication is available only from the primary site.

Global Mirror Single Direction sessions are available for the following Copy Services Manager editions and storage systems.

Global Mirror Either Direction

With Global Mirror Either Direction replication, you can run Global Mirror replication from either the primary or secondary site.

Global Mirror Either Direction sessions are available for the following Copy Services Manager editions and storage systems.

Global Mirror Either Direction with Site 3 Global Copy

A Global Mirror Either Direction with Site 3 Global Copy session is a multi-target session that consists of three sites. With Global Mirror Either Direction replication, you can run Global Mirror replication from either Site 1 or Site 2. This session type provides the ability to cascade a Global Copy relationship to Site 3, which can be used to create Safeguarded Copy backups, FlashCopy backups, or for testing purposes.

This solution provides the ability to create or schedule the creation of a consistent image at site 3 with a single command while automatically restarting the replication to ensure continued disaster recovery protection.

Global Mirror Either Direction with Site 3 Global Copy are available for the following Copy Services Manager editions and storage systems.

Global Mirror Either Direction with Two-Site Practice

With Global Mirror Either Direction with Two-Site Practice replication, you can run Global Mirror replication from either the primary or secondary site. This session type provides volumes on the primary and secondary site that you can use to practice for disaster recovery without losing your disaster recovery capability.

Global Mirror Either Direction with Two-Site Practice sessions are available for the following Copy Services Manager editions and storage systems.

Global Mirror Failover/Failback

With Global Mirror Failover/Failback replication, you can switch the direction of the data flow so that you can use your secondary site as your production site. You can then copy changes that are made at the secondary site back to the primary site.

Global Mirror Failover/Failback sessions are available for the following Copy Services Manager editions and storage systems.

Global Mirror Failover/Failback with Change Volumes

Global Mirror Failover/Failback with Change Volumes replication provides the same capabilities as the Global Mirror Failover/Failback session type. However, Global Mirror Failover/Failback with Change Volumes sessions also provide the option of enabling or disabling the use of change volumes. Change volumes are available in SAN Volume Controller and IBM Spectrum Virtualize storage systems.

Global Mirror Failover/Failback with Change Volumes sessions are available for the following Copy Services Manager editions and storage systems.

Global Mirror Failover/Failback with Practice

Global Mirror Failover/Failback with Practice replication combines Global Mirror Failover/Failback and FlashCopy capabilities to provide a point-in-time copy of the data on the secondary site. This session type provides volumes that you can use to practice for disaster recovery without losing your disaster recovery capability.

Global Mirror Failover/Failback with Practice sessions are available for the following Copy Services Manager editions and storage systems.

Metro Global Mirror

Metro Global Mirror replication provides continuous, remote data replication that operates between three sites that are varying distances apart. Metro Global Mirror combines Metro Mirror synchronous copy and Global Mirror asynchronous copy into a single session, where the Metro Mirror target is the Global Mirror source. With Metro Global Mirror replication, you can switch the direction of the data flow so that you can use your secondary or tertiary site as your production site.

Metro Global Mirror sessions are available for the following Copy Services Manager editions and storage systems.

Metro Global Mirror with Practice

Metro Global Mirror with Practice replication combines Metro Mirror, Global Mirror, and FlashCopy capabilities to provide a point-in-time copy of the data on the tertiary site. This session type provides volumes that you can use to practice for disaster recovery without losing your disaster recovery capability.

Metro Global Mirror with Practice sessions are available for the following Copy Services Manager editions and storage systems.

Metro Mirror - Metro Mirror

A Metro Mirror - Metro Mirror session is a multi-target session that consists of three sites. You can define any of the sites as the primary site and then run Metro Mirror replication from the primary site to either of the other sites individually or both sites simultaneously. For example, if Site 1 is the primary site, data replication can occur between the H1 and H2 volumes and the H1 and H3 volumes separately or at the same time.

This session type is available only for IBM DS8000 storage systems with a microcode level that supports single source to multi-target relationships. To determine whether you can use this session type, see the IBM DS8000 documentation for the microcode level that you are using.

Metro Mirror - Global Mirror

A Metro Mirror - Global Mirror session is a multi-target session that consists of three sites. From the primary site, you can define both a Metro Mirror copy and a Global Mirror copy, which allows for replication across both a short distance and long distance simultaneously.

This session type is available only for IBM DS8000 storage systems with a microcode level that supports single source to multi-target relationships. To determine whether you can use this session type, see the IBM DS8000 documentation for the microcode level that you are using.

See the IBM Redbooks® publication at http://www.redbooks.ibm.com/redpieces/abstracts/redp5434.html for more specific details on how to set up this session type on the FlashSystem A9000 and A9000R storage systems.

Metro Mirror - Global Mirror with Practice

A Metro Mirror - Global Mirror with Practice session is a multi-target session that consists of three sites. From the primary site, you can define both a Metro Mirror copy and a Global Mirror copy, which allows for replication across both a short distance and long distance simultaneously. This session type provides volumes that you can use to practice for disaster recovery without losing your disaster recovery capability.

This session type is available only for IBM DS8000 storage systems with a microcode level that supports single source to multi-target relationships. To determine whether you can use this session type, see the IBM DS8000 documentation for the microcode level that you are using.

Metro Mirror - Global Mirror with Site 3 Global Mirror

A Metro Mirror - Global Mirror with Site 3 Global Mirror session is a multi-target session that consists of three sites. From the primary site, you can define both a Metro Mirror copy and a Global Mirror copy, which allows for replication across both a short distance and long distance simultaneously. After recovery to Site 3, this session allows a Global Mirror replication back to either Site 1 or Site 2 and a cascaded Global Copy to the third site. This action provides disaster recover capabilities while production runs at Site 3.

This session type is available only for IBM DS8000 storage systems with a microcode level that supports single source to multi-target relationships. To determine whether you can use this session type, see the IBM DS8000 documentation for the microcode level that you are using.

Metro Mirror - Global Mirror with Site 4 Replication

A Metro Mirror - Global Mirror with Site 4 Replication session is a multi-target session that consists of four sites. From the primary site, you can define both a Metro Mirror copy and a Global Mirror copy, which allows for replication across both a short distance and long distance simultaneously. After recovery to Site 4, this session allows a Global Mirror replication back to either Site 1, Site 2, or Site 3, and a cascaded Global Copy to the fourth site. This action provides disaster recover capabilities while production runs at Site 4.

This session type is available only for IBM DS8000 storage systems with a microcode level that supports single source to multi-target relationships. To determine whether you can use this session type, see the IBM DS8000 documentation for the microcode level that you are using.

Metro Mirror - Metro Mirror with Site 4 Replication

A Metro Mirror - Metro Mirror with Site 4 Replication session is a multi-target session that consists of four sites. From the primary site, you can define a Metro Mirror - Metro Mirror copy, which allows for replication across two short distances simultaneously. After recovery to Site 4, this session allows a Metro Mirror replication back to either Site 1, Site 2, or Site 3, and a cascaded Metro Copy to the fourth site. This action provides disaster recovery capabilities while production runs at Site 4.

This session type is available only for IBM DS8000 storage systems with a microcode level that supports single source to multi-target relationships. To determine whether you can use this session type, see the IBM DS8000 documentation for the microcode level that you are using.

4 Site Replication Enhanced

A 4 Site Replication Enhanced session is a multi-target session that consists of four sites. From the primary site, you can define both a Metro Mirror copy and a Global Mirror copy, which allows for replication across both a short distance and long distance simultaneously while also providing the ability to cascade a Global Copy to the fourth site. The session is similar to the Metro Mirror - Global Mirror with Site 4 Replication session, however, has jounral volumes at all four sites and uses the DS8000 Cascaded Incremental Resynchronization feature of the 9.4 release of microcode to provide more flexibility and options in the event of certain disasters or planned site switch events.

This session type is available only for IBM DS8000 storage systems with a microcode level that supports Cascaded Incremental Resynchronization (9.4+). To determine whether you can use this session type, see the IBM DS8000 documentation for the microcode level that you are using.

Safeguarded Copy

A Safeguarded Copy session is designed to capture many point-in-time images of a production environment with optimized capacity usage and minimized performance impact. The backup created by a Safeguarded Copy session can be recovered to another set of volumes while the production environment continues to run. Safeguarded Copies help to prevent the data from being compromised, either accidentally or deliberately. Therefore, the Safeguarded Copy session type offers another layer of security in your environment.

Migration

The new Migration session is available starting with Copy Services Manager 6.2.10. The Migration session is a two-volume session type with roles H1 and H2.

The Migration session ignores the rule that the primary and secondary have to be the same size and type. Therefore, you can use this session to migrate data from one set of volumes to another, regardless of size, as long as the hardware supports it.

You can only start a Migration session from H1. You cannot start in Metro Mirror mode. And a Migration session running in Global Copy mode will not manage freeze or run conditions.

You can still manually Suspend or Stop the session for consistent or inconsistent suspends. And you can Recover the session to failover the pairs, thereby allowing the targets to be writable.

From the Target Available state, you can only restart in the original direction or terminate. You cannot restart in the opposite direction.

Extent Space Efficient Sizer

The ESE Sizer session supports analyzing space requirements for DS8000 Extent Space Efficient (ESE) FlashCopy and Safeguarded Copy.

An accurate sizing of ESE FlashCopy and Safeguarded Copy is crucial. With the DS8880 microcode 8.5.4 release and DS8900F 9.1 release a Write Monitoring (WM) bitmap is implemented in the DS8000 to track all write to each volume.

The purpose of the Write Monitoring Bitmap is to provide an effective way to determine usable space requirements for both Extent Space Efficient (ESE) FlashCopy and Safeguarded Copy without impacting host write I/O or disk replication performance. The write monitoring bitmap enables a DS8000 to track the amount and locality of its changed data over definable time intervals and across a set time period in an existing production environment.

The new session type queries the Write Monitoring bitmap and provides output files on box and volume level. These output files contain the currently allocated extents, changed tracks, changed small extents and change large extents. This level of detail can readily be used to determine how much capacity will be allocated over time for both functions ESE FlashCopy and Safeguarded Copy.

The following tool can be used to process the data collected from the Copy Services Manager ESE Sizer session to provide more accurate capacity sizings in the configurations. Refer the link https://www.ibm.com/support/pages/node/6372180 for more detailed information regarding ESE Sizer session and the collected data.

The ESE Sizer session can start, stop, and reset the WM bitmap. With the available properties, you can define the volume query interval and the bitmap reset interval.