HP StorageWorks 64 FW 07.00.00/HAFM SW 08.06.00 McDATA Products in a SAN Envir - Page 228
consuming the ISL bandwidth., Destination devices are unaware of the PDCM array con d
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Physical Planning Considerations 5 Figure 5-5 PDCM Array - Example Problem A PDCM array configured for Director A prohibits logical port address 05 from communicating with logical port addresses 0A, 0B, and 0C. No PDCM array is configured for Director B. The PDCM array configured for Director A prohibits the source server from transmitting or receiving data across ISL 2. However, internal route tables at both directors indicate a valid server-to-destination device path across ISL 1. A problem arises when the source server transmits Class 3 Fibre Channel data to devices across ISL 1, consuming the ISL bandwidth. Destination devices are unaware of the PDCM array configured at Director A and transmit frames back to the server across ISL 2. Because the server is prohibited from communicating across this ISL, Class 3 Fibre Channel frames are discarded without generating a busy (BSY) frame, reject (RJT) frame, or otherwise notifying the destination devices. The server receives no response from destination devices and times out. Thus, a server or device failure is indicated, when in fact the problem is a user-defined prohibited connection. 5-22 McDATA Products in a SAN Environment - Planning Manual