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Posted by on August 27, 2006, 3:56 am
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Dophi wrote:
> There are many metrics for a service group.
> For Application Redirection, these metrics have different algorithm
> with SLB.
>
> Minmisses : When minmissesis specified for a real server group
> performing Application Redirection, all requests for a specific IP
> destination address will be sent to the same server. This is
> particularly useful in caching applications, helping to maximize
> successful cache hits. Best statistical load balancing is achieved when
> the IP address destinations of load balanced frames are spread across a
> broad range of IP subnets.
>
> Hash: =EF=BB=BFFor Application Redirection, all requests for a specific IP
> destination address will be sent to the
> same server. This is particularly useful for maximizing successful
> cache hits. =EF=BB=BFThe hash metric should be used if the statistical lo=
ad
> balancing achieved using minmissesis not as optimal as desired.
> Although the hashmetric can provide more even load balancing at any
> given instance, it is not as effective as minmisses when servers leave
> and reenter service.
>
> So,. I think you might misunderstand the algorithm of metrics between
> SLB and Applicaiton Redireciton.
> For your case, if you use sip, sport, or sport + dport for algorithm,
> the bandwidth of your Internet access and resource of a proxy server
> will be consume rapidly because each proxy server has to access the
> same content on the Internet everytime when a client wanna access a
> resource which was cached by another proxy server.
>
> cconnell_1@lycos.com wrote:
> > Hi,
> > We currently load balance proxy servers on the alteon, in transparent
> > mode so traffic flow generally goes
> >
> > client--> alteon(inport filter
> > redirect)-->-proxy(in)--proxy(out)-->-alteon--->internet
> > internet-->alteon(filter
> > redirect)-->proxy(out)-->proxy(in)-->alteon-->client
> >
> > The filters redirct tcp traffic to the real server group. And the
> > stickyness is acheived by setting thash sip, and dip, and the hash
> > metric.
> >
> > This ensures all client sessions with the same ip go through the same
> > proxy(there are 3 proxy real servers)
> >
> > My question is can we load balance by another way (not IP stickyness)
> > but achive session sticyness on the the same proxy, maybe bye using
> > sport, dport hash or something?
> >
> > I know that cisco css firewalls use sport+dport hash and therefore give
> > a better load balance.
> > Thanks
Thankyou. In our envronment we use application redirection and filters
to send requests to the proxy servers. So my question is how this ties
in. For the 2 filters(client to proxy on way out, internet to proxy on
way back) we thash on sip which I guess means the same sip of the
client is sent to the same proxy server each subsuqent request and dip
on the way back (as there are 2 interfaces on proxy one in, one out)
However for the filters we cant use sport+dport together to load
balance. But this would somehow affect the metric for the slb group as
that is set to hash/minmisses, in our case I guess we cant use
leastconns as the hash/minmisses sends requests to the same internet
webserver to the same proxy.
So my question is how do the paremters in the slb group used with
application redirection affect the thash paramters in the filters? I do
understand though that using another metric would be bad for cache
hits.
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