Initiator ports and rcu target ports, Journal groups – HP XP Continuous Access Software User Manual
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The XP Continuous Access Journal remote copy configuration between the primary storage system
and secondary storage system has the following requirement (see
):
•
XP Continuous Access Journal supports a 1-to-1 remote copy connection in one journal group
pair. In one journal group pair, one primary storage system can be connected to only one
secondary storage system. This configuration ensures the backup data consistency of two or
more volumes (for example, large databases) within the same storage system.
•
When the version number of XP Continuous Access Journal is 60-07-10-00/00 and higher,
one primary storage system can be connected to two secondary storage systems. For the
connection configuration, see
“ 3DC Multi-target Configuration of Three XP Continuous Access
and
“3DC Cascading Configuration of Three XP Continuous Access
Note: HP strongly recommends that you establish at least two independent remote copy connections
from the primary storage system to the secondary storage system, and vice versa, to provide
hardware redundancy for this critical communications path.
Initiator Ports and RCU Target Ports
The initiator port and the RCU target port are required at both the primary storage system and
secondary storage system.
•
The initiator port at the secondary storage system is connected to the RCU target port at the
primary storage system.
•
The initiator port at the secondary storage system issues a read journal command to the primary
storage system, and then the RCU target port at the primary storage system sends journal data
to the secondary storage system in response to the read journal command.
Any Fibre Channel interface port on the storage system can be configured as an initiator port. The
initiator ports cannot communicate with the host processor channels. The host channel paths must
be connected to the Fibre Channel interface port not the initiator port.
Note: Two or more initiator ports must be configured before you can add the secondary storage
systems and create the XP Continuous Access Journal volume pairs.
The Fibre Channel interface ports that are assigned to the RCU target ports can be connected to
the host channel paths via the Fibre Channel switch.
See
“Configuring Port Attributes” (page 144)
for information on configuring the host interface port.
Journal Groups
A journal group consists of two or more data volumes and journal volumes. Tailor XP Continuous
Access Journal to the unique business content of users by using this journal group.
Table 1 Journal and Data Volume Names and Systems
Location in Journal Group
Location in Storage System
Name
Master Journal Group
Primary Storage System
Primary Data Volume
Restore Journal Group
Secondary Storage System
Secondary Data Volume
Master Journal Group
Primary Storage System
Master Journal Volume
Restore Journal Group
Secondary Storage System
Restore Journal Volume
The data update sequence from the host is managed by the journal group. The data update
sequence consistency between the master and restore journal groups to be paired is maintained
and ensured. The master and restore journal groups are managed according to the journal group
number. The journal numbers of master and restore journal groups that are paired can be different.
One data volume and one journal volume can belong to only one journal group.
XP Continuous Access Journal Components
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