HP StorageWorks XP Remote Web Console Software - Manual (Page 15)

Initiator Ports and RCU Target Ports
The initiator ports are the dedicated Fibre Channel interface ports on the main storage system
(MCU) to which the RCUs (RCU target ports) are connected. The initiator ports connect to the RCUs
to send write I/O operations directly to the RCUs. Any Fibre Channel interface port of the storage
system can be configured as an initiator port. The XP Continuous Access software allows you to
change the configuration of the storage system's Fibre Channel ports (ordinary target port, initiator
port, or RCU target port) as needed.
Two or more initiator ports must be configured before you can add the RCUs and create the XP
Continuous Access pairs. The initiator ports cannot communicate with the host processor channels.
To enable the host processor channels to send write I/O operations to the MCU, the host channel
paths must be connected to the other Fibre Channel interface ports in the MCU. Ordinary Fibre
Channel interface ports cannot be connected to the MCU. These ports (usually called target ports)
can be connected to the host processor channels only.
The RCU target ports are the dedicated Fibre Channel interface ports on the remote storage system
(RCU) to which the MCU (initiator ports) are connected. Any Fibre Channel interface port on the
storage system can be configured as an RCU target port. The RCU target ports can be connected
to the host channel paths via the Fibre Channel switch.
Storage System XP Continuous Access Remote Web Console Software
The Remote Web Console Java application includes XP Continuous Access and Hitachi TrueCopy™
for Mainframe. Remote Web Console software communicates with the SVP of the storage system
via defined TCP/IP connections. For further information on Remote Web Console operations, see
the HP StorageWorks XP24000/XP20000 Remote Web Console User Guide or contact your HP
service representative.
If you plan to perform XP Continuous Access operations using RAID Manager, you must use the
XP Continuous Access software to add the consistency groups and select the desired group options
and async options before you can add any XP Continuous Access pairs. These functions can only
be performed using the XP Continuous Access software. Once the consistency groups and async
options have been configured, the RAID Manager software can be used to establish and manage
XP Continuous Access pairs.
If you use the Remote Web Console software to perform XP Continuous Access operations instead
of RAID Manager, the MCU of each XP Continuous Access pair must be LAN-attached to the Remote
Web Console computer. You should also attach all RCUs to a Remote Web Console computer on
a separate LAN at the remote site. Having a separate storage system LAN at the remote site enables
you to access the RCUs and XP Continuous Access S-VOLs and perform XP Continuous Access
operations at the remote site in the event that the main site is not available (for example, due to
disaster). If you need to perform XP Continuous Access operations in the reverse direction from the
remote site to the primary site (for example, disaster recovery), the XP Continuous Access software
at the remote site simplifies and expedites this process.
If the Remote Web Console computer is not installed contact your HP service representative for
information on XP Continuous Access 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),
depending on your installation requirements and standards. The storage system program products
do not provide host-failover functions.
When XP Continuous Access is used as a data migration tool, host failover is recommended but
not required. When XP Continuous Access is used as a disaster recovery tool, host failover is
required to ensure effective disaster recovery operations. When an XP Continuous Access pair is
XP Continuous Access Components 15