HP XP7 Storage - Manual (Page 27)

See the step for Priority in the procedure in “Creating the Cnt Ac-J initial copy ” (page 43) .
Disaster recovery considerations
You begin a disaster recovery solution when planning the Cnt Ac-J system. The following are the
main tasks for preparing for disaster recovery:
•
Identify the data volumes that you want to back up for disaster recovery.
•
Pair the identified volumes using Cnt Ac-J.
•
Establish file and database recovery procedures.
•
Install and configure host failover software error reporting communications (ERC) between the
primary and secondary sites.
For more information on host failover error reporting, see the following topic. Also, review “Cnt
Ac-J disaster recovery operations ” (page 87) to become familiar with disaster recovery processes.
Host failover software
Host failover software is a critical component of any disaster recovery effort. When a primary
system fails to maintain synchronization of a Cnt Ac-J pair, the primary system generates sense
information. This information must be transferred to the remote site using the host failover software
for effective disaster recovery. RAID Manager provides failover commands that interface with
industry-standard failover products.
Sharing volumes with other XP7 software volumes
Continuous Access Journal volumes can be shared with other product volumes. Sharing pair volumes
enhances replication solutions, for example, when Continuous Access Journal and Continuous
Access Synchronous or Business Copy volumes are shared.
For planning information, see the following:
•
“Sharing Cnt Ac-J volumes ” (page 117)
•
“Configurations with Continuous Access Synchronous” (page 124)
•
“Configurations with Business Copy” (page 137)
Planning Cnt Ac-J in multiple XP7s using a consistency group
Copy operations can be run simultaneously on multiple Cnt Ac-J pairs residing in multiple primary
and multiple secondary systems. This is done by placing journals in the primary systems in a RAID
Manager consistency group. Data update order in copy processing is guaranteed to the secondary
systems.
With multiple systems, the journals in the paired secondary systems are automatically placed in
the consistency group.
With multiple systems, you can also place the journals from both OPEN and mainframe systems
in the same RAID Manager consistency group.
In addition, Continuous Access Journal volumes in multiple systems can be shared with Continuous
Access Synchronous pairs. See
“Configurations with Continuous Access Synchronous” (page 124)
for more information:
Any combination of primary and secondary system journals can be used. For example, you can
include journals from four primary systems and four secondary systems, two primary systems and
one secondary system, and so on.
An example configuration is shown in the following figure.
Disaster recovery considerations 27