HP XP P9500 Software User's Manual page 310

1. Stop operation on the primary site.
2. From the local site, execute the YKSUSPND FLUSH command for the Continuous Access
Journal for Mainframe copy pair between the primary site and the remote site.
YKQUERY
YKSUSPND FLUSH
YKEWAIT GOTO(SUSPEND)
3. From the local site, execute the YKSUSPND REVERSE command for the Continuous Access
Synchronous for Mainframe copy pair.
YKQUERY
YKSUSPND REVERSE
YKEWAIT GOTO(SUSPEND)
Operation at the local site can be started before executing the YKRESYNC DELTAJNL
command. However, the time it takes for the delta resync pairs between the local site and the
remote site to change to the DUPLEX status after execution of the YKRESYNC DELTAJNL
command increases depending on the amount of update data from the local site.
4. From the local site, execute the YKRESYNC REVERSE command for the Continuous Access
Synchronous for Mainframe copy pair.
If the storage system of the primary site is not running, this step is not required.
310 Maintenance and Troubleshooting Operations