The Operational Testing Function - HP XP P9500 Software User's Manual

1. When the YKCONMSG command is executed, Business Continuity Manager monitors operating
system messages for detecting a hardware failure.
2. When a failure is detected, the following three commands are executed in the order shown,
and copy processing for all copy pairs within the copy group is executed.
YKFREEZE: Freezes the copy group in order to suspend update (I/O) operations from
the host to all volumes within the copy group. This status is called the SCP status.
YKSUSPND: Suspends copy processing among all copy pairs within the copy group.
YKRUN: Releases volume updates that were held and allows I/O operations to resume.
If you need to acquire the copy group status, execute the YKRUN command, and then execute
either the YKQUERY or the YKEWAIT command.
Figure 3-4 shows the execution of the Continuous Access Synchronous consistency preservation
function.
Figure 43 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.
The Operational Testing Function 79