v The other activities that are occurring on the DS8000
FlashCopy
supports the following copy options:
Consistency groups
Creates a consistent point-in-time copy of multiple volumes, with negligible
host impact. You can enable FlashCopy consistency groups from the
command-line interface (DS CLI).
Change recording
Activates the change recording function on the volume pair that is
participating in a FlashCopy relationship. This enables a subsequent refresh
to the target volume.
Establish FlashCopy on existing Metro Mirror source
Allows you to establish a FlashCopy relationship where the target volume is
also the source of an existing remote mirror and copy source volume. This
enables you to create full or incremental point-in-time copies at a local site
and then use remote mirroring commands to copy the data to the remote
site.
Fast reverse
Reverses the FlashCopy relationship without waiting for the finish of the
background copy of the previous FlashCopy. This option applies to the
Global Mirror mode.
Inhibit writes to target
Ensures that write operations are inhibited on the target volume until a
refresh FlashCopy operation is complete.
Multiple Relationship FlashCopy
Allows a source volume to have multiple target volumes at the same time.
Persistent FlashCopy
Allows the FlashCopy relationship to remain even after the FlashCopy
operation completes. You must explicitly delete the relationship.
Refresh target volume
Provides the ability to “refresh” a FlashCopy relationship, without recopying
all tracks from the source volume to the target volume.
Reverse restore
Reverses the FlashCopy relationship and copies data from the target
volume to the source volume.
Reverse FlashCopy relationships
The direction of a FlashCopy relationship can be reversed, in which case the
volume that was previously defined as the target becomes the source for the
volume that was previously defined as the source (and is now the target). The data
that has changed is copied to the volume previously defined as the source.
You can reverse a FlashCopy relationship if you want to restore a source volume
(Volume A) to a point-in-time before you performed a FlashCopy operation. In
effect, you are reversing the FlashCopy operation so that it appears as though no
FlashCopy operation ever happened. Keep in mind that the background copy
process of a FlashCopy operation must complete before you can reverse volume A
as the source and volume B as the target.
There might be certain circumstances when you might need to reverse an original
FlashCopy relationship. For example, suppose you create a FlashCopy relationship
Chapter 8. Optional feature codes for the DS8000 111
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