HP StorageWorks SAN Virtualization Services Platform administrator guide (5697-8056, March 2009)

3. Perform a controlled failback of each virtual disk to the new main site, as follows:
a. Plan a downtime window for the application, based on the organization’s needs and any
data that was not yet mirrored.
b. At the scheduled time, shut down the application, which is currently using a virtual disk on
the DR site.
c. Unmount the virtual disk on the host.
d. Connect to the DR SVSP domain.
e. Remove the host permission from the virtual disk. Since the virtual disk has PiTs, this involves
either disconnecting the host or powering the host down, and deleting the host from the host
list once the host’s status changes to Absent.
f. Create a user PiT.
g. Wait until the mirror service has finished copying the user PiT to the main site.
h. Suspend the group.
i. Split the group.
j. Connect to the main site SVSP domain.
k. Assign the host permission to use the virtual disk on the main site.
l. Run a merge on the virtual disk, specifying the virtual disk on the DR site as the destination
virtual disk. Do not enable rollback. The mirror service creates an async mirror group and
task, mirroring from the main site to the DR site.
Site failover recovery with asynchronous mirrors78