HP StorageWorks 2/24 FW 07.00.00/HAFM SW 08.06.00 McDATA Products in a SAN Env - Page 92
Public Versus Private Devices, Public device
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Planning Considerations for Fibre Channel Topologies 3 Public Versus Private Devices Sphereon 4300 and 4500 Fabric Switches support connection of public and private arbitrated loop devices as follows: • Public device - A loop device that can transmit a fabric login (FLOGI) command to the switch, receive acknowledgement from the switch's login server, register with the switch's name server, and communicate with fabric-attached devices is a public device. Sphereon 4300 and 4500 Fabric Switches provide loop connectivity for the Fibre Channel architectural limit of 127 devices per Fibre Channel port, when configured as an FL_Port. Each FL_Port is assigned one arbitrated loop physical address (AL_PA), leaving 126 AL_PAs per port available for device connections. Up to 32 public devices can be connected to each of the FL_Ports (12 ports for the Sphereon 4300 Switch, 24 ports for the Sphereon 4500 Switch). As shown in Figure 3-3, server S2 is a public loop device connected to a Sphereon 4500 Switch and can communicate with fabric-attached device D1. Figure 3-3 Public Device Connectivity Public devices support normal fabric operational requirements, such as fabric busy and reject conditions, frame multiplexing, and frame delivery order. 3-6 McDATA Products in a SAN Environment - Planning Manual