Oracle Real Application Clusters (RAC): Jumbo Frames Notes/Recommendations

In this post, i shall quickly summarize recommendations for implementing Jumbo Frames on the Oracle Real Application Clusters (RAC) Private Cluster Interconnect.

Notes/Recommendations:

• It is recommended to implement Jumbo Frames for the RAC Cluster Interconnect for better overall performance.
• Interconnect Latency is significantly reduced by implementing Jumbo Frames.
• Implementing Jumbo Frames reduces the UDP, TCP, Ethernet overhead.
• The ifconfig -mtu 9000 shall implement Jumbo Frames with an MTU of 9000 (1500 for smaller frames).
• Test the RAC cluster thoroughly after configuring Jumbo Frames.

References: 

• Recommendation for the Real Application Cluster Interconnect and Jumbo Frames (Doc ID 341788.1)
• How to Validate Network and Name Resolution Setup for the Clusterware and RAC (Doc ID 1054902.1)
• Problem - Dropped segments and bad checksums caused by Jumbo frames. (Doc ID 1073610.1)
• System experiences memory shortage when using nxge with jumbo frames and NFS (Doc ID 1353254.1)