AOS and clustering
原文转载:http://sjakalax.blogspot.com/2010/10/aos-and-clustering.html
AOS and clustering
A few statements to (hopefully) clear things up a bit:
Several possibilities from that point on:
A user connects to a specific AOS as defined in his client configuration. In case there is more than one AOS defined in the configuration the first available will be used.
You can create a load balancing cluster (administration - setup - cluster configuration) and link AOS instances to it. Again two options:
A user connects to a any of the AOS's as defined in his client configuration. He cannot predict which AOS he will eventually host his session.
In this same example it is possible the load (CPU, memory usage, ...) created by those 3 connections on AOS A is much higher than the load generated by the 4 connections on AOS B. Still the next connection will be hosted by A.
Therefore:
- Is it possible to directly connect to a non-load balancer AOS in an AOS cluster with dedicated load balancer? Yes it is.
- Does a non-load balancer AOS in an AOS cluster with a dedicated load balancer also balances load?
Yes it does.
All bad news? No ma'am: an AOS cluster makes sure the load is equally spread over the different nodes. You can add or remove nodes to the cluster online. But in fact … that's about it … and besides the load spreading, a cluster doesn't do more than a well considered config file does.
Other things you might not yet know regarding AOS's:
- Each active not-dedicated loadbalancing AOS instance requires one AOS license. You can install as many AOS instances as you wish, but the number of active instances is limited by the license. You cannot have more active AOS instances than your license allows on the same Ax environment.
- In the online users form you only get to see the SPID's of the users that are on the same AOS as you are
- You can prevent users to connect to an AOS using the 'reject new clients' button on the 'server instances' tab of the online users form. Hit 'accept new clients' to undo this.
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