HP StorageWorks 8/80 HP StorageWorks Fabric OS 6.2 administrator guide (5697-0 - Page 433

Table 83 Supported Distances (continued) Maximum supported distances with 2112 Byte Frame Size (1-port allocated all unreserved buffer credits) in km @ Switch/blade model 1 Gb/s 2 Gb/s 4 Gb/s 8 Gb/s HP StorageWorks 400 500 250 100 N/A Multi-Protocol Router HP StorageWorks 4/256 SAN 500 250 100 N/A Director 16 Port 4Gb Blade HP StorageWorks B-Series iSCSI 500 250 100 N/A Director Blade HP StorageWorks 4/256 SAN 500 250 100 N/A Director 32 Port 4Gb Blade HP StorageWorks 4/256 SAN Director 48 Port 4Gb Blade HP StorageWorks SAN Director 48 Port 4Gb FC blade HP StorageWorks SAN Director 16 Port 8Gb FC blade HP StorageWorks SAN Director 32 Port 8Gb FC blade HP StorageWorks SAN Director 48 Port 8Gb FC blade 500 500 2588 / 2780 2588 / 2780 2460 / 2652 250 250 1294 / 1390 1294 / 1390 1230 / 1326 100 100 647 / 695 647 / 695 615 / 663 N/A N/A 324 / 348 324 / 348 308 / 332 B-Series Multi-Protocol Router 500 250 100 N/A Blade NOTE: QoS requires an additional 14 buffer credits per active port so maximum supported distances may be lower. The HP StorageWorks SAN Director 6 Port 10Gb FC blade supports a maximum distance of 100 km on each of the 6x 10 Gb/s ports. To get an estimated maximum equally distributed distance for n number of ports at a particular ("X") speed, divide the 1-port maximum distance of the switch at X speed by n. For example, for three ports running at 2 Gb/s on HP StorageWorks 8/8 and 8/24 SAN Switches, the maximum equally distributed distance is: 486 / 3 = 164 km. Buffer credit recovery Buffer credit recovery does not require configuration. This feature allows links to recover after R_RDYs are lost when the credit recovery logic is enabled. The buffer credit recovery feature also maintains performance. If a credit is lost, a recover attempt is initiated. During link reset, the frame and credit loss counters are reset without performance degradation. This feature is supported only on E_Ports that are configured for long distance and are connected between the following switch or blade models: • HP StorageWorks 8/8 and 8/24 SAN Switches, HP StorageWorks 8/40 SAN Switch, HP StorageWorks 8/80 SAN Switch • HP StorageWorks SAN Director 16 Port 8Gb FC blade, HP StorageWorks SAN Director 32 Port 8Gb FC blade, HP StorageWorks SAN Director 48 Port 8Gb FC blade If a long-distance E_Port from one of these supported switches/blades is connected to any other switch or blade type, the buffer credit recovery feature is disabled. Fabric OS 6.2 administrator guide 429