How to set up SF Oracle RAC for jumbo frames on Solaris

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  • Article ID:000040341


Need steps to set up SF Oracle RAC for jumbo frames on Solaris


Jumbo frames provide the ability for an Ethernet frame to exceed its IEEE 802 specified Maximum Transfer Unit of 1500 bytes up to a maximum of 9000 bytes.
Before you enable jumbo frames in an SF Oracle RAC environment, verify that the following components support them:
  • NICs used for private interconnects on all the hosts
  • Network switches connecting the private interconnects
Perform the following steps to configure jumbo frames with SF Oracle RAC:
  1. Configure the switches to work with jumbo frames.
  2. Configure each NIC used for private interconnect to accept jumbo. Refer to the corresponding NIC and operating system documentation for more information.
    For example:
    For ce cards, edit /platform/sun4u/kernel/drv/ce.conf file and add the following line:
    For e100g cards, edit /kernel/drv/e1000g.conf  file  and change MaxFrameSize parameter for the required interface:
            # 0 is for normal ethernet frames.
            # 1 is for upto 4k size frames.
            # 2 is for upto 8k size frames.
            # 3 is for upto 16k size frames.
            # These are maximum frame limits, not the actual ethernet frame
            # size. Your actual ethernet frame size would be determined by
            # protocol stack configuration (please refer to ndd command man pages)
            # For Jumbo Frame Support (9k ethernet packet)
            # use 3 (upto 16k size frames)
  3. Configure the MTU in /etc/hostname.{NIC.EN_US to be used for an IP address, if required.
  4. Configure MTU to be used by LLT interfaces in /etc/llttab, if required. If MTU is not set in /etc/llttab, it will adjust MTU as per the interface MTU.
    To restrict LLT to use an MTU of 9194, change the /etc/llttab as follows:
    link <tag> <device> - ether - 9194

Please review related technical notes for known issues.


Applies To

SF Oracle RAC 5.0 MP3 and later releases

Terms of use for this information are found in Legal Notices.



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