HP AE370A HP StorageWorks Fabric OS 6.x administrator guide (5697-0015, May 20 - Page 368

Table 81 Switch, port speed, and distance with ASIC and buffers Switch blade model ASIC Total ports in a switch or blade Total ports in a group 4/8 SAN Switch Golden Eye 16 or 4/16 SAN Switch SAN Switch Condor 32 4/32 and SAN Switch 4/32B 4/64 SAN Condor 64 Switch 272/16 1000/32 712/16 400 Multi-protocol (MP) Router Condor 16 441/8 FR4-18i Condor 16 441/8 FC4-16iP Condor 8 680/8 FC4-16 Condor 16 712/16 FC4-32 Condor 32 752/16 FC4-48 Condor 48 752/24 FC10-6 Egret and Condor 6 712/1 FC8-16 Condor2 16 FC8-32 Condor2 32 1420/16 *1516/16 1420/16 *1516/16 FC8-48 Condor2 48 1420/24 *1516/24 Reserved buffers for ports 8 8 8 8 8 8 8 8 8 N/A 8 8 8 NOTE: Additional buffers are available with 4Gbps chassis for 8Gbps blades because of fewer buffers allocated for back-end port connections. Fabric considerations Because the number of buffer credits available for use within each port group is limited, configuring buffer credits for extended links may impact the performance of the other ports in the group used for core-to-edge connections. Balance the number of long-distance ISL connections and core-to-edge ISL connections within a switch. Configuring long-distance ISLs between core and edge switches is possible, but is not a recommended practice. With the exception of older switches and blades that use the Bloom ASIC, all switch ports provide protection against buffer depletion through buffer limiting. A buffer-limited port reserves a minimum of eight buffer credits, allowing the port to continue to operate rather than being disabled due to a lack of buffers. The 8 buffer minimum allows 4 Gbps speeds over distances within most data centers. Buffer-limited operation is supported for the L0 and LD extended ISL modes only, and is persistent across reboots, switch disabling and enabling, and port disabling and enabling. 368 Administering Extended Fabrics