HP StorageWorks XP Direct Backup Engine Software - Manual (Page 26)

26 HP Surestore Direct Backup Engine XP: User’s Guide
Port Types of Direct Backup Engine and Fibre Channel Continuous Access
XP
For the FC CA operations, three port types are required: ordinary target
port, MCU initiator port, and RCU target port. The initiator port and target
port of Direct Backup Engine are equivalent to the MCU initiator port and
ordinary target port of FC CA in the primary MCU respectively. When the
same FC CA secondary (RCU) is used as the Direct Backup Engine
backup device, the RCU target port of FC CA cannot be specified as the
backup destination of Direct Backup Engine. However, when the array,
which performs the Direct Backup Engine operations, is the same as the
FC CA secondary RCU, the RCU target port of FC CA can be used as the
target port of Direct Backup Engine. Please refer also to chapter 2 for the
ports of Direct Backup Engine and FC CA.
Note: FC CA is the XP Continuous Access XP feature option that supports
remote copy operations via fibre-channel interfaces. Please refer also to
the product documentation for Continuous Access operations.
Table 1 shows the relationship between port types (attributes) and the
number of connections.
Table 1. Port Types and the Maximum Number of Connections
No. Port Type Connectable Hosts Connectable MCUs Connectable Targets
1 Ordinary Target 255 0 -
2 RCU Target 128 16 -
3 MCU Initiator - - 64
The restrictions and conditions on changing the port types are as follows:
The type of port, which belongs to any port group, cannot be changed.
Initiator ports cannot be changed to RCU target ports of FC CA.
If you want to change an ordinary target port or RCU target port to an
initiator port, the port package (CHF PK) for FC CA is required.
If you want to change an ordinary target port to an initiator port, make
sure that no SCSI path is assigned for that ordinary target port.
If you want to change an RCU target port to an initiator port or an
ordinary target port, make sure that no CA path is assigned between
the MCU initiator port and that RCU target port.
If you want to change an initiator port to an ordinary target port, make
sure that no CA logical path is assigned for that initiator port.
Note: If the conditions above are not met, an error will occur.