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recording is enabled, only change data is sent to the production site to synchronize
the volumes, thereby reducing the time that is required to complete the failback
operation.
When it is safe to return to your production site, assuming that no physical damage
has occurred to the storage unit in the location, you can delete paths and create
new ones from your production site to your recovery site. Then, you can create a
failback recovery request to restore the storage unit as the production storage unit
in the relationship.
The following considerations are for failover and failback operations:
v The failover operation does not reverse the direction of a remote mirror and copy
v The failback recovery operation can be issued against any remote mirror and
z/OS Copy Services
Copy Services functions are also supported in a z/OS environment. These functions
allow you to create a point-in-time copy or to mirror data at your remote or recovery
site as applications make changes to the source volumes at your production site.
z/OS Copy Services includes the following functions:
v z/OS Global Mirror
v z/OS Metro/Global Mirror
z/OS Global Mirror
z/OS Global Mirror (previously known as Extended Remote Copy or XRC) provides
a long-distance remote copy solution across two sites for open systems and z/OS
data using asynchronous technology.
DS8000 storage complexes support the z/OS Global Mirror function only on zSeries
hosts. The z/OS Global Mirror function mirrors data on the storage unit to a remote
location for disaster recovery. It protects data consistency across all volumes that
you have defined for mirroring. The volumes can reside on several different storage
units. The z/OS Global Mirror function can mirror the volumes over several
thousand kilometers from the source site to the target recovery site.
With z/OS Global Mirror, you can suspend or resume service during an outage. You
do not have to end your current data-copy session. You can suspend the session,
and then restart it. Only data that changed during the outage must be
resynchronized between the copies.
If you must change the default setting for an outage, you can do so through the DS
Storage Manager. See the DS Storage Manager online help for more information.
IBM service representatives must identify and set up the DS8000 Copy Services
servers before you can use the DS8000 Copy Services Web interface.
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pair. It changes a target device into a suspended source device, while leaving the
source device in its current state.
copy volume that is in a primary suspended state. The operation copies required
data from the source volume to the target volume in order to resume mirroring.
Failback operations are commonly used after a failover operation has been
issued to restart mirroring either in the reverse direction (remote site to local site)
or in the original direction (local site to remote site).
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