Resynchronizing FlashCopy relationships using DS CLI

Complete this task to resynchronize (apply incremental changes on the source volume to) a FlashCopy^® target volume. After the initial FlashCopy operation, only data that has changed on the source volume since the last resynchronization operation was performed is copied to the target volume.

The change recording option and the persistent option must have been enabled on the FlashCopy volume pair. When a pair is established with the -record and -persist parameters, the pair initially synchronizes and then a record of all host write operations to the source is maintained in the source volumes.

You can resynchronize a FlashCopy target volume to create a new point-in-time copy of your data without waiting to copy an entire volume for each point-in-time copy. Instead, only tracks that have changed on the source volume since the last resynchronization operation was performed are copied to the target volume. The specified parameters in this command replace the parameters in the existing relationship. In order to keep the initial -record and -persist parameters, specify the -record and -persist parameters with the resyncflash command.

You can perform this task using either the DS CLI or the DS Storage Manager.

Perform the following step to resynchronize FlashCopy relationships with DS CLI commands. The example commands in this task are shown in two formats. The first format shows the type of information the command requires. The second format is an example command with declared values for the variables.

Issue the resyncflash command to resynchronize FlashCopy relationships. Enter the resyncflash command at the dscli command prompt with the following parameters and variables:

dscli>resyncflash -dev storage_image_ID sourcevolumeID:targetvolumeID

Example

dscli>resyncflash IBM.1750-68FA120/0100:IBM.1750-68FA120/0200

The resulting output

Date/Time: Sun Aug 11 02:23:49 PST 2004 IBM DS CLI Version: 5.0.0.0 
DS: IBM.1750-68FA120

FlashCopy pair IBM.1750-68FA120/0100:IBM.1750-68FA120/0200 successfully incremented.