Emilio,
I don't think I explained it very well. I don't have any problems with
performance on my test RDP farm. I was only worried about the quality of the
load-balancing after several hours of several hundred people connecting.
For information, the largest of the farms will be approximately 80 servers with
600-700 users. I intend to start small and watch performance and resource
utilisation carefully to make sure this is possible, however.
Laura's suggestion of the "weight" algorithm combined with persistent sessions
sounds perfect and it would be wonderful to see it included. For now I will
test with round-robin persistence. The users must be connected to their old
session if possible and so this looks like the best place to start.
Regards
David
From: Emilio Campos [mailto:[email protected]]
Sent: 18 October 2011 18:38
To: [email protected]
Subject: Re: [Zenloadbalancer-support] Algorithms
Martin which number of real ip servers with rdp do you have? I readed on your
screenshot that you configured 10, please could you change this number to the
same number of servers that you have?
And about the patch that laura send you , we are going to add on the new
release ;)
About your slowness with your RDP gateway, we unknow the cause, We made test on
our development environment with terminal servers and all worked like a charm,
If you feel It is interesting feel free for send us more information about this
issue.
Thanks!
El 18 de octubre de 2011 16:48, Laura García Liébana <[email protected]>
escribió:
Hi David,
The weight algorithm uses the backends concurrent connections number to
calculate the "load" of every server. This load is used to balance the new
connection to the best server. In your case, the weight value has to be the
same for every backend.
In order to obtain an additional session persistence with weight algorithm is
not supported by pen, but it could be quite easy to include it.
Regards,
Laura.
2011/10/18 David Martin (IT) <[email protected]>
Hi all,
Now I have got a Zen cluster up-and-running successfully, I'm turning
my attention to the type of load balancing algorithm to use.
I can see why Round-Robin with persistence is probably the best option
for things like http, every connection is fairly short lived and so the balance
remains good.
Since I want to use Zen for RDP, I think this might not work so well.
Each session can last for anything from 15 minutes up to eight hours and so by
the end of the day a simple round-robin would leave an unevenly distributed
farm.
On our current F5 boxes, we use an algorithm that always picks the
server with the fewest connections, but uses persistence to reconnect in the
event of a problem. Do any of the Zen or Pen modes allow for something like
this? I'm going to try with RR anyway to see if the problem is big enough to
worry about but it would be good to hear what other people are doing for this
kind of farm.
Regards
David
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