Refresh target volume — Select copy options

Introduction

The FlashCopy operation provides the capability to resync a FlashCopy relationship. When you establish an initial FlashCopy relationship with Make relationships persistent and the Enable change recording options enabled, only changed data is copied from the source to target volume when subsequent FlashCopy operations are run. If you did not enable these options when you created the FlashCopy relationships, the target volumes of these FlashCopy volume pairs cannot be resync later and the process fails.

Menu path

Fields

Make relationships persistent

Indicates whether the FlashCopy relationship is retained after the background copy completes. When the FlashCopy is persistent, the relationship between the source and the target volume remains indefinitely and the FlashCopy relationship must be deleted. The persistent option is a prerequisite if you want to resync the target volume of a FlashCopy relationship later. It is automatically enabled if you selected the Enable change recording option.

Note: If the FlashCopy relationship is not persistent, Resync is not available from the Select Action pull down.

Enable change recording

Indicates whether change recording is enabled or disabled. The change recording function monitors write operations and records changes on the volume pair.

When change recording is enabled on a FlashCopy volume pair, the persistent option is automatically enabled on the same volume pair as well because both are required when you want to resync the FlashCopy relationship later.

Permit FlashCopy to occur if target volume is online for host access

Indicates whether a FlashCopy relationship is allowed to be created if the target volume in that relationship is online to a zSeries^® host system.

Inhibit writes to target volume

Indicates whether writes are inhibited to the target volume of the selected FlashCopy pair as long as the FlashCopy relationship exists. That is, when this option is enabled, any write operations to the target volume of the selected FlashCopy volume pair will fail as long as the FlashCopy relationship still exists. In addition, when this option is enabled, the target volume is protected from any updates from the host system and ensures that writes are prohibited on the target volume until a resync operation is complete.

Note: If the Inhibit writes to target volume option is enabled for a specific FlashCopy relationship, the change recording feature is not effective on the target volume of that FlashCopy pair.

Sequence number for these relationships

Displays the sequence number that is defined for the FlashCopy relationships if the number is the same for all relationships. Otherwise, this value does not display.

Establish target on existing Metro Mirror source

Creates a point-in-time copy of a volume, and, through Metro Mirror, makes a copy of that point-in-time copy at a remote site. This option creates a local point-in-time backup and a remote point-in-time backup.