What is the persistence setting on the Load Balancers? Is it different if
persistence is turned off competely? Weighting servers will throw this off
completely.
Thanks-
Peter J. Milanese, Senior Systems Engineer
Information Technology Group
The New York Public Library
peterm@xxxxxxxx - 212.621.0203
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|Arunkumar Janarthanan <arunkumar.webadmin@xxxxxxxxx> |>--------------------------------------------------------------------------------------------------------------------------------------------------|
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|users@xxxxxxxxxxxxxxxx |
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|01/28/2010 12:41 PM |
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|Re: Apache Server status page shows uneven number of requests across load balanced web servers |
Could anyone help me with this issue ? I still see the number of workes
differing to each Apache though it configured for well load balancing ?
On Wed, Jan 27, 2010 at 3:50 PM, Arunkumar Janarthanan <
arunkumar.webadmin@xxxxxxxxx> wrote:
Gary,
Here is the netstat output attached from one of the webserver where the
connections are on HIGH numbers. Regarding the load balancer I am trying
to explore more setting options.
Thanks again for looking into this issue.
Best Regards,
Arun J
On Wed, Jan 27, 2010 at 2:49 PM, Gary Smith <gary.smith@xxxxxxxxxxxxx>
wrote:
Arun,
This is just a WAG, but I think that the problem still lies in the
client side and how the load balancer is handling the requests. I would
still be interested in seeing the netstat -atunep output from one of he
affected machines when there is a high level of connections in a closed
state. Even though the sessions aren’t sticky, is it possible that the
load balancer is handling keep alive in such a way that it’s sending the
back to the original server but on in a new state? (that’s a little
beyond my knowledge though).
Gary Smith
From: Arunkumar Janarthanan [mailto:arunkumar.webadmin@xxxxxxxxx]
Sent: Wednesday, January 27, 2010 11:37 AM
To: users@xxxxxxxxxxxxxxxx
Subject: Re: Apache Server status page shows uneven number
of requests across load balanced web servers
Thanks Gary,
The load balancing method we use is weight based, so apparently the load
balancer suppose to send the traffic to the web server has least number
of connections. However the Netscaler support confirmed they see
eventual number of traffic routed to all 4 web servers.
Regarding the Apache restart time, I restarted all 4 servers same time
and checked could still see the requests on 1 & 3 are being handled. I
dont think we have sticky session enabled at loadbalancer level.
For the same problem we have not before changed the load balancer
settings from sourceIP persistence to Weight based to have the load
distributed equal on all the servers.
IP port Type State Req/s
731-...30_80 x.x.x.x 80 HTTP UP 16/s
731-...31_80 x.x.x.x 80 HTTP UP 16/s
731-...31_80 x.x.x.x 80 HTTP UP 14/s
731-...55_80 x.x.x.x 80 HTTP UP 20/s
Rsp/s Reqb/s Rspb/s ClntConn SvrConn MaxConn
SurgeQ
731-...30_80 16/s 12406/s 345117/s 7 285 0
0
731-...31_80 16/s 10956/s 365025/s 7 262 0
0
731-...31_80 14/s 11140/s 368655/s 6 268 0
0
731-...55_80 20/s 14322/s 420105/s 7 272 0
0
However the Apache server status still shows the number of requests
being handled huge difference.
I have attached the balancer-manager page as well with this email.
Best Regards,
Arun J
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