[lvs-users] Scalability

Robinson, Eric eric.robinson at psmnv.com
Thu Aug 27 18:58:15 BST 2009

Thanks for the reply, Graeme. 

> It's important that you separate the two things which ldirectord/the 
> director are doing and view them independently of each other:

> 1. Doing load balancing (the director's kernel).
> 2. Health checking the realservers and manipulating 
> the LVS table (ldirectord).

I do try to keep those separate in my mind, but thanks for the reminder.

> The amount of RAM you have restricts the number of table entries your 
> director can keep state on (this is magnified if you're using the 
> netfilter conntrack stuff at the same time)

Which kind of brings me back to an earlier posting here that went
unresolved. I'm still not sure why I'm seeing double the number of
connections in my backup director's table than in the master.

> These days though the amount of RAM and multi-core CPUs (with NICs
using CPU 
> affinity automagically to spread their interrupt load) have become so
> in raw terms that your network is likely to be the bottleneck!

That's pretty much what I thought, but every so often I like to check
back and make sure. :-)

Eric Robinson

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