The IBM TotalStorage Resiliency Family is a set of hardware and software features,
products, and services that are available on the IBM TotalStorage DS8000 and IBM
TotalStorage Enterprise Storage Server Models 750 and 800. The DS8000 has a
number of advanced Copy Services functions that are part of the IBM TotalStorage
Resiliency family. Copy Services is a collection of functions that provides disaster
recovery, data migration, and data duplication functions. Copy Services runs on the
DS8000 storage unit and supports open systems and zSeries environments.
The following are key features of the IBM TotalStorage Resiliency family:
v Point-in-time copy, which includes FlashCopy
v Remote mirror and copy, which includes the following functions:
– IBM TotalStorage Metro Mirror
– IBM TotalStorage Global Copy
– IBM TotalStorage Global Mirror
v Remote mirror and copy for z/OS, which includes z/OS Global Mirror and z/OS
Metro/Global Mirror, and is available only for zSeries environments
Disaster recovery using Copy Services
The prime purpose for backing up, copying, and mirroring data is in preparation for
a possible disaster.
Having a disaster recovery plan can ensure that critical data is recoverable at the
time of a disaster. Because most disasters are unplanned, your disaster recovery
plan must provide a way that allows you to recover your applications quickly, and
more importantly, to access your data. This means that you must be able to restart
your critical applications at a backup site.
Disasters often occur over a period of time. This type of unplanned disaster, called
a rolling disaster, is the most common. Other unplanned outages include fatal
hardware failures or data center damage that is caused by natural occurrences,
such as earthquakes or hurricanes. Planned outages include system maintenance
operations, and although they are intended, planned outages can be just as
effective as unplanned outages at removing service from users.
Most users decide to use a combination of remote mirror and copy and point-in-time
copy features to form a comprehensive enterprise solution for disaster recovery.
Disaster recovery solutions include, but are not limited to the following functions:
Global Mirror
Global Mirror provides recoverable copies of your production data at a long
distance remote site by continually forming consistent sets of data with no
significant performance impact. This allows a quick restart at your remote
site in case of a disaster at your production site.
Failover and failback operations
A failover operation is the process of switching production to a remote site.
A failback operation is the process of returning production to its original
location after a disaster. These operations help reduce the time that is
required to synchronize remote mirror and copy volumes after switching
between sites during planned and unplanned outages.
106 DS8000 User’s Guide
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