Reverse relationship — Select copy options

Use this page to select one or more copy options to reverse the FlashCopy^® relationship. That is, the original source volume is now the target, while the original target volume becomes the source of the FlashCopy relationship.

Introduction

When a relationship is reversed, only the data required to bring the target current to the source’s point-in-time is copied. If no updates were made to the target since the last refresh, the direction change could be used to restore the source back to the previous point-in-time state.

Menu path

Real-time manager > Copy services > FlashCopy > Select one or more volume pairs > Select Action: Reverse FlashCopy > Go

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.
Enable change recording: Indicates whether change recording is enabled. 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 refresh 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 prohibited 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, the target volume is protected from any updates from the host system and ensures that writes are prohibited on the target volume until a refresh target volume operation is complete.
Note: If you 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.
Fast reverse: Indicates whether the selected FlashCopy relationship can be reversed without waiting for the background copy of the previous FlashCopy to complete. This option is used with Global Mirror operations.
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.
Note: If the FlashCopy sequence number that is specified matches the sequence number of a current relationship or if a sequence number is not specified, then the selected operation is performed. If the FlashCopy relationships do not have the same sequence number, the sequence number is not displayed and the operation is not performed.