HP StorageWorks 2/16V HP StorageWorks Fabric OS 5.3.0b Release Notes (AA-RWEYF - Page 14

FCIP Access Gateway vs Standard Switch Mode Access Gateway Mode Port State portcfgdefault command function change for the Brocade 4Gb SAN Switch for HP c-Class BladeSystem Update to Brocade 4Gb SAN Switch for HP c-Class BladeSystem instructions. • Frame drops observed on FCIP slow links: • The frame drops occur when the FCIP tunnel bandwidth is set to 10 Base-T (10Mbps), E1 (1.048Mbps), or T1 (1.544Mbps). • With E1 or T1, frames drop even without an impaired link. • With 10 Base-T, frame drops may be observed when a low impairment is put to the link. • The portperfshow command indicated incorrect (smaller) bidirectional throughput on the FCIP tunnel when Fastwrite/Tape Pipelining is enabled. • Fastwrite/Tape Pipelining did not inform user when it failed due to multiple equal paths configured on 2 GbE ports. • Backup jobs initiated from the Symantec BackupExec application slowed noticeably after adding significant I/O traffic from regular hosts and targets to the FCIP tunnel. A port-based routing policy must be used for Tape devices. When using the Blade server SAN switch in Access Gateway mode, most switch features are no longer applicable. These features include Admin Domains, Advanced Performance Monitoring, direct connection to SAN target devices, Fibre Channel Arbitrated Loop support, Fabric Manager, FICON, IP over FC, ISL Trunking, Extended Fabrics, Management Services, Name Services (SNS), port mirroring, Secure FOS, SMI-S, and Zoning. These switch features are available in the default switch mode of operation. Access Gateway mode is not supported in the p-class Blade system if there are two half-height servers in the same sleeve (Server Slot 1 and 9, 2 and 10, and so on). Two p-class half-height servers in the same sleeve require Fibre Channel Arbitrated Loop operation. The c-Class half-height Blade servers do not require Fibre Channel Arbitrated Loop and work fine with both access gateway mode and Standard Switch Mode. When a disabled port on a switch in Access Gateway mode is connected to a configured loop HBA, the port state alternates between Nosync and Insync. The switchShow command displays the state of the remote HBA port that is continuously attempting to reconnect to the disabled port. Access Gateway mode is not supported in the p-Class BladeSystem if there are two half-height servers (BL3xp) in the same sleeve (Server Slot 1 and 9, or 2 and 10, etc). That configuration requires Fibre Channel Arbitrated Loop operation, which conflicts with Access Gateway mode. There is no such restriction with c-Class, since no servers require Fibre Channel Arbitrated Loop. Access Gateway supports only FCP initiator connections on the F_Ports. Note that cascading Access Gateway devices or connecting FCP targets, loop devices, or FICON channel/control units on the F_Ports are not supported. Beginning with Fabric OS 5.2.1b, the portcfgdefault command now resets the configuration to HP factory default port settings. After connecting to the Brocade 4Gb SAN Switch via the Onboard Administrator (OA) connect command, you will be in the switch CLI prompt. To return to the OA serial prompt: • Type Exit to log out of the switch. • Press Shift-Ctrl-underscore (escape sequence) to return to the OA prompt. 14