Configuring Port Attributes
The administrator at both the primary site and the secondary site must configure ports on the primary storage system and the secondary storage system in the following ways:
•The administrator at the primary site must configure target ports, initiator ports, and RCU target ports on the primary storage system.
•The administrator at the secondary site must configure initiator ports and RCU target ports on the secondary storage system.
Ports on USP V storage system have the target attribute by default. If you are configuring USP V storage systems, you must determine ports that should be used as initiator ports or RCU target ports, and then you must change the attribute of the ports from target to initiator or RCU target. The port attributes are explained below:
•Target: A target port is a Fibre Channel port used for connecting a storage system and a host. When the host issues a write request, the request will be sent to a volume via a target port on the storage system. Target ports must be configured on primary storage systems for URz operations.
•Initiator: An initiator port is a Fibre Channel port that sends commands to a remote storage system. Initiator ports must be configured on both primary and remote storage systems for URz operations.
•RCU target: An initiator port is a Fibre Channel port that receives commands from a remote storage system. RCU target ports must be configured on both primary and remote storage systems for URz operations.
•External: An external port is a port that is required for Universal Volume Manager copy operations. This port will not be used for URz copy operations.
If necessary, you can change this port to an target port, an initiator port, or an RCU target port.
•Initiator/external: This setting shows the combination of ports that have an initiator port and an external port attributes. Only port that has an initiator port attribute within these ports can be used for URz. This attribute cannot be changed by the URz software. For details on the port to which an initiator/external mix mode is set, please refer to the Universal Volume Manager User's Guide.
Note: If initiator ports and RCU target ports are not configured on both primary and remote storage systems, the following problem will occur and remote copy operations will not be performed:
•The administrator at the primary site will be unable to create any pair of a primary data volume and a secondary data volume.
•The secondary storage system will be unable to read data from journal volumes in the primary storage system.
Chapter 5 Configuring Storage Systems and Logical Paths |
