Using the synchronized-before-create method
This method has advantages over the full synchronization method because it does not require all the data to be copied over a constrained link. However, if the data needs to be copied, the master and auxiliary disks cannot be used until the copy is complete, which might be unacceptable.
Before you begin
Ensure that the master and auxiliary VDisks contain identical data before you create the Metro
Mirror relationship. You can ensure that the VDisks contain identical data in one of two ways:
- Create both VDisks with the format VDisk before use feature to make all data zero.
- Make a complete tape image (or other method of moving data) so that all data is copied from one VDisk to the other.
About this task
Using either method, ensure that no write input/output (I/O) operations take place to either the master or auxiliary VDisk before the Metro Mirror relationship is established. Perform the following steps to create a synchronous copy:
Procedure
- Issue the create relationship command with the synchronization option.
- Issue the start Remote Copy relationship command without the clean option.