HP XP7 Continuous Access Journal User Guide (TK911-96002)

paired with the Cnt Ac-J S-VOL.See “Delta resync configuration ” (page 127) for more
information.
• If a failure occurs in the Cnt Ac-S system (P-VOL and S-VOL), business is resumed using the
Cnt Ac-J S-VOL. When the failure is corrected, business tasks are transferred back to the local
site.
• If a failure occurs in the Cnt Ac-J system (P-VOL and S-VOL), business is resumed using the Cnt
Ac-S S-VOL.
See “Recovery for 3 Cnt Ac-J/Cnt Ac-S DC multi-target configuration ” (page 90) for recovery
information and procedures.
Prerequisite information for 3DC multi-target
• XP7 must be installed at the local, Cnt Ac-S intermediate, and Cnt Ac-J remote sites.
• RAID Manager is recommended at all sites.
• Remote Web Console is required at all sites.
• The local site requires the following:
Cnt Ac-S◦
◦ Cnt Ac-J
◦ Cnt Ac-S P-VOL = Cnt Ac-J P-VOL. This is the primary production volume.
◦ Cnt Ac-J master journal volume
• The intermediate site requires the following:
Cnt Ac-S◦
◦ Cnt Ac-J
◦ Cnt Ac-S S-VOL
• The remote site requires the following:
Cnt Ac-J◦
◦ Cnt Ac-J S-VOL
◦ Cnt Ac-J remote journal volume
• 3DC multi-target can be used in configurations with multiple primary and secondary systems.
However, delta resync configurations are not supported in configurations with multiple primary
and secondary systems.
Procedure for setting up 3DC multi-target
Procedure 39 To set up a 3DC multi-target configuration
1. Install and set up Cnt Ac-S and Cnt Ac-J on the required systems.
2. Create a Cnt Ac-S pair on the primary system. For instructions, see the HP XP7 Continuous
Access Synchronous User Guide.
3. When Cnt Ac-S pair status is PAIR, create the Cnt Ac-J pair on the primary system. The mirror
ID must be set between 1 and 3.
Delta resync configuration
With the delta resync configuration, you bring the S-VOL to a consistent state more quickly after
failure because only missing differential data must be copied.
Delta resync configuration 127