"Translated from MoS article" the protocol used by the private network with the Oracle RAC

Said too classic, dare not translate, directly on the original.

From:

Network protocols and Real application Clusters (document ID 278132.1)

PURPOSE
-------

Purpose of this document are 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 has available on their platform.

NETWORK protocols and REAL application CLUSTERS
-----------------------------------------------

With Real application Clusters, there is many different interconnect protocols
Available to use with the high speed interconnect.

On Unix platforms, Oracle typically recommends Infiniband (RDS) where it's certified.  see
note:751343.1 for More information in the RDS protocol.  here is the hardware and RAC protocol
Alternatives for each platform (not including RDS):

Operating systemclusterwarenetwork Hardwarerac Protocol---------------------------------------------------HP Openvmshp openvmsgigabit ethernettcp (UDP for 10gr1 and above) HP tru64hp truclustermemory Channel rdghp tru64hp trucluster Memory Channel udphp tru64hp truclustergigabit Ethernet rdghp tru64hp truclustergigabit Ethernet udphp-uxoracle Clusterwa Rehyperfabricudphp-uxoracle clusterwaregigabit Ethernet udphp-uxhp serviceguardhyperfabricudphp-uxhp Serviceguardgigabit Ethernet udphp-uxveritas clustergigabit Ethernet llthp-uxveritas clustergigabit Ethernet UDPIBM Aixoracle clusterwaregigabit Ethernet (FDDI) udpibm aixhacmpgigabit Ethernet (FDDI) udplinuxoracle clusterwaregigabit Ethernet udpmicrosoft windowsoracle clusterwaregigabit Ethernet tcpsun solarisoracle clusterwaregigabit Ethernet UDPSun Solarisfujitsu primeclustergigabit etherneticfsun solarissun clustersci interconnectrsmsun SolarisSun ClusterFirelink Interconnectrsmsun Solarissun clustergigabit Ethernet udpsun solarisveritas CLustergigabit Ethernet lltsun solarisveritas clustergigabit 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 do 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, on 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 in 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 this 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
----------------------

-Least a Gigabit Ethernet for optimal performance
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

"Translated from MoS article" the protocol used by the private network with the Oracle RAC