HP XP Continuous Access Software - Manual (Page 28)

NOTE:
HP strongly recommends establishing at least two independent remote copy connections from the
primary array to the secondary array and vice versa to provide hardware redundancy for this critical
communications path.
Initiator and RCU target ports
Initiator and RCU target ports are required at the primary and secondary arrays. The initiator port at
the primary array is connected to the RCU target port at the secondary array through a Fibre Channel
interface. The initiator port at the secondary array is connected to the RCU target port at the primary
array. The initiator port at the secondary array issues a read journal command to the primary array. In
response to the read journal command, the RCU target port at the primary array sends journal data to
the secondary array.
You can configure any Fibre Channel interface port on the local array as an initiator port. Initiator ports
cannot communicate with host processor channels. Host channel paths must be connected to a Fibre
Channel interface port other than the initiator port.
NOTE:
Two or more initiator ports must be configured before you can add secondary arrays and create
Continuous Access XP Journal volume pairs.
You can connect Fibre Channel interface ports assigned as RCU target ports to host channel paths
through a Fibre Channel switch.
See
Configuring port attributes for more information about configuring host interface ports.
Continuous Access XP Journal and the XP Remote Web Console Software
The XP Remote Web Console software includes Continuous Access XP Journal software for the local array.
The XP Remote Web Console software communicates with each local array's SVP through defined TCP/IP
connections. For more information about XP Remote Web Console operations, see the HP StorageWorks
XP Remote Web Console user guide for XP12000/XP10000/SVS200 or contact your HP account
support representative.
For remote operations using the XP Remote Web Console software, the management station at the primary
site must be attached to the primary array. You should also attach a XP Remote Web Console web client
at the secondary site to all secondary arrays. You can then use the web client to change the secondary
array's Continuous Access XP Journal parameters and access the Continuous Access XP Journal secondary
data volume (for example, for media maintenance). To to simplify and expedite Continuous Access XP
Journal operations in the reverse direction — from the remote site to the primary site (for example, disaster
recovery), you can use the XP Remote Web Console web client installed at the secondary site.
NOTE:
If the XP Remote Web Console web client is not installed, contact your HP account support representative
for information about Continuous Access XP Journal configuration services.
Host failover software
Host failover software, which transfers information between host servers at the primary and remote sites,
is a critical component of any disaster recovery effort. Host failover is configured using the desired host
failover software product for the platform (for example, Microsoft Cluster Server or HP Serviceguard),
depending on your installation requirements and standards. The Command View XP or XP Remote Web
Console software products do not provide host failover functions.
28 Overview of Continuous Access XP Journal