Liong: Have you looked at average query response time statistics? Perhaps this could shed some light on your issue. A graph of response time vs. current requests for a given resource might help you narrow down the issue if it's not a load balancer issue or just requests processed / second compared between the two servers would give you more conclusive evidence that the load balancer is doing the wrong thing.
-Jerry Jerry Champlin Absolute Performance Inc. -- Enabling businesses to deliver critical applications at lower cost and higher value to their customers. On Mon, Sep 12, 2011 at 9:38 PM, Liong Kok Foo <kokfoo.li...@innity.com>wrote: > Hi Jerry, > > Appreciate the quick reply and pointing out this difference. > > However, we are aware of some server having swap and some not. We have > explored turning swap on or off but it doesn't solve the issue. > > Thanks. > > Liong Kok Foo > > > On 9/13/2011 11:15 AM, Jerry Champlin wrote: > > Liong: > > The only significant difference in the stats you posted is that the server > without a load problem has no swap configured and the other one does. I > would not expect that to cause a problem but that's the only difference that > jumps off the page. > > -Jerry > > Jerry Champlin > Absolute Performance Inc. > -- > Enabling businesses to deliver critical applications at lower cost and > higher value to their customers. > > > On Mon, Sep 12, 2011 at 9:02 PM, Liong Kok Foo <kokfoo.li...@innity.com>wrote: > >> Hi, >> >> We have been using haproxy for many years now. Implemented it in few of >> our systems. However, we have been facing some odd problem which we are not >> sure if it is related to haproxy. The odd problem is that one of the server >> is having higher load than the others. That is the last server in the LB but >> we tried switching it to second last and still see only this server giving >> high load. We also tried cloning the server from one of the existing server >> that doesn't have this problem but it still is giving this problem. >> >> We have checked with the cloud provider to see if the odd server is hosted >> in a different cloud segment in their datacenter. Doesn't seems so from >> their reply. >> >> We have setup 5 instance of servers in the cloud computing hosted by >> voxel. One is being used as haproxy server and the other 4 is running apache >> serving website. >> >> Specs of the cloud servers: >> 1 core CPU >> 2GB RAM >> Ubuntu 10.04 LTS >> Haproxy 1.3.25 >> >> Check the screen shot for the haproxy stats. We allocated weight of >> 1:1:1:1. We just doesn't understand why the extra load on this server. >> >> Top for server 69 (no problem): >> top - 10:51:08 up 145 days, 16:34, 1 user, load average: 1.06, 1.22, >> 1.27 >> Tasks: 117 total, 2 running, 115 sleeping, 0 stopped, 0 zombie >> Cpu(s): 28.8%us, 7.6%sy, 0.0%ni, 61.3%id, 0.0%wa, 0.0%hi, 2.1%si, >> 0.2%st >> Mem: 2050000k total, 1587608k used, 462392k free, 760100k buffers >> Swap: 0k total, 0k used, 0k free, 432848k cached >> >> Top for server 70 (load problem) >> top - 10:51:23 up 32 days, 22:21, 1 user, load average: 3.09, 2.99, 2.50 >> Tasks: 115 total, 3 running, 112 sleeping, 0 stopped, 0 zombie >> Cpu(s): 38.5%us, 11.0%sy, 0.0%ni, 48.2%id, 0.0%wa, 0.0%hi, 2.3%si, >> 0.0%st >> Mem: 2050000k total, 1049708k used, 1000292k free, 264264k buffers >> Swap: 1052248k total, 876k used, 1051372k free, 418272k cached >> >> Sometimes server B's load will shoot up to 20 or more while server A (and >> the rest remain at around 5). >> >> Would really appreciate any input on this matter. >> >> Thanks. >> >> -- >> Liong Kok Foo >> >> >
