Summary: Load balance in IP Multipathing not observed on V240 server
2007-12-25 5:23:00
njd at ndietsch.com
john4251 at gmail.com
alineberger at navcirt.navy.mil
ndo at unikservice.com
kev.smith at atosorigin.com
jcc.costa at gmail.com
Michael.Horton at acntv.com
and others on holiday.
Sun IPMP ONLY "load balance" outgoing network traffic. In order to
reduce the NIC failure warnings messages in syslog, the
"FAILURE_DETECTION_TIME" in "/etc/default/mpathd" was set back to 10000
instead of 2500. The response from default gateway was slow and extra
gateways were added to improve the response time for NIC "probe".
The in-bound network traffic still switch over from one NIC to another
NIC and vice versa every hour or so. I don't know whether this is the
behaviour of IPMP from Sun. I could not find further info to confirm.
Regards
Alan
Alan Kong wrote:
> Dear Managers,
>
> We have IP Multipathing setup on 2 NICs on a Sun V240 server and
> observed load balancing was not working.
>
> Our network monitoring(MRTG) program on the 2 network ports on
> different switches have network traffic recorded. When there was
> traffic recorded on one NIC, there appeared to be no network traffic
> on the other NIC. This lasted for about an hour and the network
> traffic switched over to the other NIC. The switch over of network
> traffic on both NICs repeated on an hourly fasion.
>
> Evironment:
> - Solaris 2.8 running on V240 server in NIS+ environment
> - Both logical addresses have been added to DNS and NIS+ host table
>
> /etc/hostname.bge0:
> v240server-bge0 netmask + broadcast + group production deprecated
> -failover up
> addif v240server netmask + broadcast + failover up
>
> /etc/hostname.bge1:
> v240server-bge1 netmask + broadcast + group production deprecated
> -failover up
> addif v240server-dum netmask + broadcast + failover up
>
> Both network ports were running GBits. Applications and users uses
> v240server address.
>
> Please advise on solving the problem and whether IP Multipathing works
> in NIS+ environment since only one host address (v240server) was added
> to the NIS+ cred table.
>
> Thank you.
>
> Regards
> Alan Kong
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