Re: RAC interconnect packet size??
Date: Tue, 21 Apr 2009 14:42:25 +0200
Message-ID: <fbb8fbcd0904210542v4c36c6e7x416ca4c6829fb6d8_at_mail.gmail.com>
Did you investigate the exact properties of your interconnect? I don't know which operating system you've used, if it's linux, use iperf to measure host-to-host latency and MTU sizes. If one of the networking components do not support a 9000 MTU, it will break down the packages to 1500, which cost time.
(iperf is not available in the RHEL or OEL repo's use EPEL to obtain it: http://fedoraproject.org/wiki/EPEL)
frits
On Tue, Apr 21, 2009 at 2:13 PM, <TESTAJ3_at_nationwide.com> wrote:
>
> We tried to use 9000 MTU on the interconnect and were getting intermittent
> node evictions due to communication errors, for those of you running RAC,
> are you using jumbo frames on your network cards and switch(es)? We've had
> to back down to 1500 for reliability.
>
> HP DL380-G5, 64G of ram, 3 nodes.
>
> Just looking to see what everyone else is doing.
>
> thanks., joe
>
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