Remote Mirror And Copy Functions; Flashcopy Function (Point-In-Time Copy); Safeguarded Copy - IBM DS8880 Series Introduction And Planning Manual

Remote mirror and copy functions

FlashCopy function (point-in-time copy)

Safeguarded Copy

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DS8880 Introduction and Planning Guide
v The Copy Services license should be ordered based on the total usable capacity
of all volumes involved in one or more Copy Services relationships.
v The licensed authorization must be equal to or less that the total usable capacity
allocated to the volumes that participate in Copy Services operations.
v You must purchase features for both the source (primary) and target (secondary)
storage system.
The Copy Services license establishes the extent of IBM authorization for the use of
the remote mirror and copy functions on your storage system.
The following functions are included:
v Metro Mirror
v Global Mirror
v Global Copy
v Metro/Global Mirror
v Multiple Target PPRC
FlashCopy creates a copy of a source volume on the target volume. This copy is
called a point-in-time copy.
When you initiate a FlashCopy operation, a FlashCopy relationship is created
between a source volume and target volume. A FlashCopy relationship is a
"mapping" of the FlashCopy source volume and a FlashCopy target volume. This
mapping allows a point-in-time copy of that source volume to be copied to the
associated target volume. The FlashCopy relationship exists between this volume
pair from the time that you initiate a FlashCopy operation until the storage unit
copies all data from the source volume to the target volume or you delete the
FlashCopy relationship, if it is a persistent FlashCopy.
The Safeguarded Copy feature, available with the Copy Services license, creates
backups of data that you can restore to the source volume or a different volume.
The Safeguarded Copy feature creates safeguarded backups that are not accessible
by the host system and protects these backups from corruption that can occur in
the production environment. You can define a Safeguarded Copy schedule to create
multiple backups on a regular basis, such as hourly or daily. You can also restore a
backup to the source volume or to a different volume. A backup contains the same
metadata as the safeguarded source volume.
Safeguarded Copy can create backups with more frequency and capacity in
comparison to FlashCopy volumes. The creation of safeguarded backups also
impacts performance less than the multiple target volumes that are created by
FlashCopy.
With backups that are outside of the production environment, you can use the
backups to restore your environment back to a specified point in time. You can
also extract and restore specific data from the backup or use the backup to
diagnose production issues.
You cannot delete a safeguarded source volume before the safeguarded backups
are deleted. The maximum size of a backup is 16 TB.