Forum Discussion

jay_41157's avatar
jay_41157
Icon for Nimbostratus rankNimbostratus
Jan 28, 2009

GTM LB

Hi,

 

 

So this is what I have.

 

 

wideip.com --> wideip_pool ( at GMT)

 

 

wideip_pool --> site 1 ratio(1) / site 2ratio(1) with static persist.

 

 

 

site1 has 5 pool members

 

site 2 has 5 pool members.

 

 

Is there a way to setup the LB at GTM so that the ratio is 1:1 but dependent on the of active pool members at each site

 

 

so for ex if site 1 has 4 servers active and

 

site 2 has 2 servers active...

 

 

Then the LB between the sites would be 2:1 ?

 

 

i.e. eventual goal is to try and distribute the load as evenly as possible keeping in mind the LDNS from proxy sites.

 

 

 

Thanks,
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  • JRahm's avatar
    JRahm
    Icon for Admin rankAdmin
    Jan 28, 2009
    1:1 ratio might as well be round robin. Keep in mind that at the global layer, the GTM is handing out resolutions to LDNS servers, so if you have 5 LDNS resolutions, 3 would go to site 1 and 2 would go to site 2. Now, if 90% of your clients happen to be servered by the 3 LDNS servers that are pinned to site 1 (until TTL expires or your persistence record expires), then you won't be at a 50% distribution at all, or even close. If you want even distribution across both datacenters, you're probably better off putting all the virtuals from both datacenters in a single pool and using the least connections, packet rate, or kbps load balancing mechanism.