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CR_t__110670's avatar
CR_t__110670
Icon for Nimbostratus rankNimbostratus
Feb 03, 2009

Is there any way to realize load of server behind 2nd layer ltm?

For example,

 

If I have 2 layer ltm and ltm1 and ltm2 located at different site.

 

The thing is when 1st layer LTM share load to LTM1 and LTM2 with round robin method. Problem starts at this point LTM doesn't know the load of server behind LTM1 and LTM2 so server start to overwhelming and it is going to die.

 

 

Please anyone tell me.

 

 

[LTM]

 

/ \

 

/ \

 

[LTM1] [LTM2]

 

/ \

 

/ \

 

------- ------

 

Servers Server
config
design

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  • hooleylist's avatar
    hooleylist
    Icon for Cirrostratus rankCirrostratus
    Feb 03, 2009
    The easiest option might be to use least connections on the top tier LTM. Assuming the TCP connections use roughly the same server resources on average this would distribute the load equally.

     

     

    How are LTM1 and LTM2 polling the servers below them? Could you configure the same polling on the top tier LTM? I'm guessing this wouldn't be feasible, as it would require you to poll/load balance from LTM to the servers directly.

     

     

    Another option would be to use an iControl app to poll the LTM1 and LTM2 stats for their pools and use that to modify the pool ratio on the top tier LTM.

     

     

    Aaron