HP XP Racks - Manual (Page 95)

Figure 50 (page 95) shows the execution of the Continuous Access Synchronous consistency
preservation function.
Figure 50 Implementation of Cnt-Ac S Consistency Preservation Function
The operational testing function
The operational testing function enables users to perform operational testing at a secondary site
while an actual operation is being performed at the primary site. If you execute the YKSUSPND
command with the S-VOL(PERMIT) parameter specified, the S-VOL can be updated when it is
in the suspend state, allowing you to perform operational testing at the secondary site.
After the operational testing finishes, you need to change updates made to the S-VOL while
operational testing was being performed. To do so, execute the YKRESYNC command to
resynchronize a P-VOL with an S-VOL, which detects the differences between the P-VOL and the
S-VOL and applies them to the S-VOL. This helps shorten the time required to return normal
operations to the primary site by copying only the differential data and synchronizing the P-VOL
and S-VOL.
When operational testing is performed, assuming the following:
•
A disaster has affected the storage system on the primary site.
•
The P-VOL and S-VOL are running as a TrueCopy Asynchronous for Mainframe copy pair or
Continuous Access Journal Z copy pair (because a copy pair is assumed to be made up of
volumes in storage systems at remote sites).
The following procedure describes the flow of operational testing. The numbers in the following
steps correspond to the numbers in
Figure 51 (page 96) .
The operational testing function 95