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.
Ensure that the master and auxiliary VDisks contain identical
data before creating 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.
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:
- Issue the create relationship command
with the synchronization option.
- Issue the start Remote Copy relationship command without the
clean option.