[Linux-ha-dev] Re: [Linux-HA] network traffic diagram

[Sun Jiang Dong]

Interesting. BTW, do you turn on the debug switch at that time?

James Pan wrote:
> Hi,
>    The attached file is a network traffic diagram of a 3-node cluster. 
> the cluster nodes commnunicate with each other via udp broadcast.
> The following is a piece of ha.cf,  this piece specifies the UDP 
> communication port and the interface.
>        udpport         812
>        bcast           eth0
>    At the begining, all nodes were stopped, and  I started `tcpdump port 
> 812' on hadev5 to monitor the traffic. hadev5 is a node
> of the cluster.
>    At time 10:25:01,  the  nodes were started one by one. at about 
> 10:26:29,  the DC node (hadev6)  was stopped. At about 10:27:01,
> hadev6 was started again.    The pink in the diagram shows the total 
> taffic that captured by tcpdump, and the blue one shows the packets sent 
> by hadev5 only.
>    I do this to give meself a basic concept about how big the traffic 
> overhead is.  And now I'd say the traffic overhead is really small,
> especially when the cluster is in stable state.
> 
> 
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-- 
BRs,

Sun Jiang Dong