IBM DS6000 Manual Do Utilizador

IBM System Storage DS6000 Series: Copy Services with IBM System z

With this option the FlashCopy relationship can be reversed by copying over modified tracks 
from the target volume to the source volume (see Figure 7-7). The background copy process 
must complete before you can reverse the order of the FlashCopy relationship to its original 
source and target relationship. Change recording is a prerequisite for reverse restore.

The source and target bitmaps (illustrated in Figure 7-4 on page 57) are exchanged and then 
handled as described with the Incremental FlashCopy option. 

This option is used with Global Mirror. If you specify this option, you can reverse the 
FlashCopy relationship without waiting for the completion of the background copy of the 
previous FlashCopy.

Now that we have discussed the options available with FlashCopy, let us see how the 
DS6000-provided interfaces and the z/OS-provided interfaces support them; see Figure 7-8 
on page 61.