HP 4400 HP B-series Fabric OS 7.0.0a Release Notes (5697-0881, June 2011) - Page 33

mended over-subscription guidelines. General guidelines are 2:1 over-subscription without compression (for example, 1 Gbps FC traffic over 500 Mbps tunnel) and 4:1 with compression. • Any firmware activation disrupts I/O traffic on FCIP links. • Under Traffic Isolation Zone, configurations with failover enabled, non-TI zone traffic uses the dedicated path if no other E or VE paths through the fabric exist, or if the non-dedicated paths are not the shortest paths. (A higher bandwidth tunnel with multiple circuits becomes the shortest path compared to a single tunnel). • A VE/VEX Tunnel and E/EX FC port cannot connect to the same domain at the same time. • Latency measurements supported on FCIP Tunnels are for 1 GbE & 10 GbE a 200 ms round trip time and 1% loss. • HP 1606 SAN Extension Switch supports Optical and Copper Media types on GE0 and GE1 interfaces. Copper Media type is default on GE0/GE1 ports and does not support auto-sense functions. • When GE0 and GE1 have copper media connected, auto-negotiation must be enabled on the other end of this port. The only speed that can be auto-negotiated with copper media is 1 Gbps. • After inserting a 4 Gbps SFP in GE ports of an HP DC SAN Director Multiprotocol Extension Blade or HP 1606 SAN Extension Switch, sometimes sfpshow output might display Cannot read serial data! . Removing and re-inserting the SFP should resolve this issue. HP recommends that users perform sfpshow immediately after inserting the SFP and ensure SFP is seated properly before connecting the cables. • When running Fabric OS 7.0.0a or later, if any of the following features are enabled in the FCIP configuration, a downgrade operation to pre-Fabric OS 7.0.0a is blocked until the features are removed from the FCIP configuration: • Inband Management • Multigigabit Circuit • Shared GE among Logical Switches • Auto-mode compression option • VE as XISL • 10 GigE lossless failover • Modified QoS percentages • 10 GigE ARL • IP Configuration where multiple GigEs have same subnet values • A tunnel configuration on 1GE ports that has more than 4 circuits • Teradata emulation • Circuits configured explicitly to be listeners or initiators FCoE/CEE (HP 2408 24-10 GbE w/8-8 Gbps FC Base FCoE Switch and HP DC SAN Director 10/24 FCoE Blade) • Although including HP 2408 24-10 GbE w/8-8 Gbps FC Base FCoE Switch in the path of TI (Traffic Isolation) and ETI (Enhanced Traffic Isolation) Zones is not prohibited, it is not supported. Configuring HP 2408 24-10 GbE w/8-8 Gbps FC Base FCoE Switch in the TI/ETI Zone path is not recommended and results in undefined behavior. • Ethernet L2 traffic with xSTP Hello timer set to less than or equal to 3 seconds may experience momentary traffic disruption during HA failover. • Fabric OS 7.0.0a supports a new optimized model for provisioning FCoE with fewer configuration steps to enable FCoE on DCB ports. These changes do not allow the HP 2408 24-10 GbE w/88 Gbps FC Base FCoE Switch to retain FCoE configuration information following an upgrade to HP B-series Fabric OS 7.0.0a Release Notes 33