IBM DS8882F, Введение и руководство по планированию

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and promotes efficient recovery. This function is supported on the storage
system running in a IBM Z environment with version 1.7 or later at no
additional charge.
Interoperability with existing and previous generations of the
DS8000 series
All of the remote mirroring solutions that are documented in the sections above
use Fibre Channel as the communications link between the primary and secondary
storage systems. The Fibre Channel ports that are used for remote mirror and copy
can be configured as either a dedicated remote mirror link or as a shared port
between remote mirroring and Fibre Channel Protocol (FCP) data traffic.
The remote mirror and copy solutions are optional capabilities and are compatible
with previous generations of DS8000 series. They are available as follows:
v Metro Mirror indicator feature numbers 75xx and 0744 and corresponding
DS8000 series function authorization (2396-LFA MM feature numbers 75xx)
v Global Mirror indicator feature numbers 75xx and 0746 and corresponding
DS8000 series function authorization (2396-LFA GM feature numbers 75xx).
Global Copy is a non-synchronous long-distance copy option for data migration
and backup.
Disaster recovery through Copy Services
Through Copy Services functions, you can prepare for a disaster by backing up,
copying, and mirroring your data at local and remote sites.
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 to recover your applications quickly, and more
importantly, to access your data. Consistent data to the same point-in-time across
all storage units is vital before you can recover your data at a backup (normally
your remote) site.
Most users use a combination of remote mirror and copy and point-in-time copy
(FlashCopy) features to form a comprehensive enterprise solution for disaster
recovery. In an event of a planned event or unplanned disaster, you can use
failover and failback modes as part of your recovery solution. Failover and failback
modes can reduce the synchronization time of remote mirror and copy volumes
after you switch between local (or production) and intermediate (or remote) sites
during an outage. Although failover transmits no data, it changes the status of a
device, and the status of the secondary volume changes to a suspended primary
volume. The device that initiates the failback command determines the direction of
the transmitted data.
Recovery procedures that include failover and failback modes use remote mirror
and copy functions, such as Metro Mirror, Global Copy, Global Mirror,
Metro/Global Mirror, Multiple Target PPRC, and FlashCopy.
Note: See the IBM DS8000 Command-Line Interface User's Guide for specific disaster
recovery tasks.
Data consistency can be achieved through the following methods:
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DS8882F Introduction and Planning Guide