HP XP P9500 Storage User Manual
Page 108
4.
Use Business Continuity Manager to execute the YKRESYNC REVERSE command on the
Continuous Access Journal Z pair, in order to reverse the copy direction of the Continuous
Access Journal Z pair.
YKRESYNC is a command for re establishing a pair.
1.
If reversing of the copy direction fails, create a Continuous Access Journal Z pair. Ensure
that the P-VOL of the pair is a volume in the Continuous Access Synchronous Z secondary
site, and that the S-VOL of the pair is a volume in Continuous Access Synchronous Z
secondary site. To create this Continuous Access Synchronous Z pair, use Business
Continuity Manager to execute YKMAKE command on the journal corresponding to the
pair.
2.
If reversing of the copy direction ends successfully, re-create the Continuous Access
Synchronous Z pair that was released in step 1 of this procedure. To re create this pair,
use Business Continuity Manager to execute YKMAKE command on the journal
corresponding to the pair.
After the pair is re created, the system configuration changes from 3DC multi target
configuration to 3DC cascading configuration. Also, the former Continuous Access
Synchronous Z secondary volume changes to the primary volume.
YKMAKE is a command for establishing a pair.
If you followed the instruction in step (a above, and you want to transfer your business
tasks back to the primary site, you need to remove failures from the primary site and other
locations. After that, you need to change the system into 3DC multigrade configuration
as explained in
“Changing to 3DC Multi target Configuration after Recovering from
, and then follow the procedure explained in
If you followed the instruction in step (b above, and you want to transfer your business
tasks back to the primary site, you need to remove failures from the primary site and other
locations, and then follow the procedure explained in
“Transferring business tasks from
Continuous Access Synchronous Z secondary to primary site (in 3DC cascading
configuration)”
Changing to 3DC Multi target Configuration after Recovering from Primary Site Failures
If you follow the instructions in
“Recovering from primary site disaster in 3DC multi target
and then the system does not change into 3DC cascading configuration,
you can change the system into 3DC multi target configuration after removing failures from the
primary site and other locations. In the resulting 3DC multi target configuration, the former
Continuous Access Synchronous Z secondary volume will be the primary volume.
To change the system into 3DC multi target configuration:
1.
Use Business Continuity Manager to execute the YKDELETE command (a command for releasing
a pair) on the journal corresponding to the former Continuous Access Journal Z pair.
2.
If pair resynchronization has not been performed to reverse the primary volume and the remote
volume of the Continuous Access Synchronous Z pair (i.e., if the pair is suspended), use
Business Continuity Manager to execute the YKRESYNC command (a command for re
establishing a pair), so that the copy direction of the Continuous Access Synchronous Z pair
is reversed.
Transferring business tasks from Continuous Access Synchronous Z secondary to primary
site (in 3DC cascading configuration)
If you follow the instructions in
“Recovering from primary site disaster in 3DC multi target
and then the system is changed to 3DC cascading configuration, you
108 Disaster recovery operations