[Summary] Weird network problem

Solution to the problem turned out that the 880 was not set to 100, full. we had some extra characters around the "=" in the /etc/system file. The transfer speed is still asymmetric, but performance is much better.

Below is the original email.


> We have two servers that are exhibiting weird network problems.
> 
> Our findings:
> 
> traffic from db01 to app01 is slow (ftp around 6k/s)
> traffic from app01 to db01 is fast (ftp around 10000k/s)
> traffic to and from app01 and db01 from any other server is OK (ftp 2000 to 4000 k/S)
> 
> The above numbers are backed up by other network applications, ftp just gives easy to read speed numbers.
> 
> app01 and db01 are on the same switch and we have tried several ports to rule out hardware problems on the switch.
> Both are set to 100 full and the switches show the same.
> We are getting no errors on the interfaces or on the switch.
> 
> db01 is a Sun V880 using the eri0 port, running Solaris 8
> app01 is a Sun E420R using the hme0 port, running Solaris 8
> 
> output from ifconfig is identical for the two (except for the ip address and port name)
> 
> My only thought is that the 880 is overrunning the buffers on the 420 and it is thrashing the interface trying to slow it down.
> 
> Anyone with any good ideas?
> 
> Gordon Baldwin
> Open Systems Adm. Manager
> Getty Images
> 
> 
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