说的太经典了，不敢翻译，直接上原文。
来源于：
Network Protocols and Real Application Clusters (文档 ID 278132.1)
PURPOSE
-------
Purpose of this document is to give DBAs and Systems Administrators interested
in Real Application Clusters an overview and a comparison of network protocols
available.
SCOPE & APPLICATION
-------------------
DBAs and IT professionals may use this note for their physical cluster layout
and the options they have available on their platform.
NETWORK PROTOCOLS AND REAL APPLICATION CLUSTERS
-----------------------------------------------
With Real Application Clusters, there are many different interconnect protocols
available to use with the high speed interconnect.
On Unix platforms, Oracle typically recommends Infiniband (RDS) where it is certified. See
Note: 751343.1 for more information on the RDS protocol. Here are the hardware and RAC protocol
alternatives for each platform (not including RDS):
Operating System Clusterware Network Hardware RAC Protocol ---------------- ----------- ---------------- -------- HP OpenVMS HP OpenVMS Gigabit Ethernet TCP (UDP for 10gR1 and above) HP Tru64 HP TruCluster Memory Channel RDG HP Tru64 HP TruCluster Memory Channel UDP HP Tru64 HP TruCluster Gigabit Ethernet RDG HP Tru64 HP TruCluster Gigabit Ethernet UDP HP-UX Oracle Clusterware Hyperfabric UDP HP-UX Oracle Clusterware Gigabit Ethernet UDP HP-UX HP ServiceGuard Hyperfabric UDP HP-UX HP ServiceGuard Gigabit Ethernet UDP HP-UX Veritas Cluster Gigabit Ethernet LLT HP-UX Veritas Cluster Gigabit Ethernet UDP IBM AIX Oracle Clusterware Gigabit Ethernet (FDDI) UDP IBM AIX HACMP Gigabit Ethernet (FDDI) UDP Linux Oracle Clusterware Gigabit Ethernet UDP Microsoft Windows Oracle Clusterware Gigabit Ethernet TCP Sun Solaris Oracle Clusterware Gigabit Ethernet UDP Sun Solaris Fujitsu Primecluster Gigabit Ethernet ICF Sun Solaris Sun Cluster SCI Interconnect RSM Sun Solaris Sun Cluster Firelink interconnect RSM Sun Solaris Sun Cluster Gigabit Ethernet UDP Sun Solaris Veritas Cluster Gigabit Ethernet LLT Sun Solaris Veritas Cluster Gigabit Ethernet UDP
Oracle Corporation primarily tests and supports the RDS and UDP network libraries (and
TCP for Windows). For other proprietary protocols (RDG, ICF, and LLT), the
cluster vendor writes and supports the network libraries.
Oracle Corporation has done extensive testing on the Oracle provided RDS and UDP
libraries (and TCP for Windows). Based on this testing and extensive experience
with production customer deployments, at this time Oracle Support strongly recommends
the use of RDS or UDP (or TCP on Windows) for RAC environments.
RE-LINKING TO CHANGE PROTCOLS
-----------------------------
To switch to the udp protocol, shut down the instances and re-link on each node
with:
cd $ORACLE_HOME/rdbms/lib
make -f ins_rdbms.mk ipc_g ioracle
9i command:
cd $ORACLE_HOME/rdbms/lib
make -f ins_rdbms.mk ipc_udp ioracle
To confirm that the UDP protcol is being used, run the ‘oradebug ipc‘ command
as described in Note 181489.1 . Note 181489.1 also contains some tuning
recommendations for various protocols.
BEST PRACTICES FOR UDP
----------------------
- Have at least a gigabit ethernet for optimal performance
- Do not use crossover cables (use a switch)
- Increase the udp buffer sizes to the OS maximum
- Turn on udp checksumming
RELATED DOCUMENTS
-----------------
Note 181489.1 - Tuning Inter-Instance Performance in RAC and OPS
Note 751343.1 - RAC Support for RDS Over Infiniband
Oracle Real Application Clusters Installation and Configuration Guide