Setting up the Axapta Cluster environment
The Axapta Object Server environment offers a load balancing feature -
called the Axapta Object Server Cluster. A number of object servers can be
assigned to the same Axapta Object Server Cluster. A client be configured to
connect to a Cluster. It will then choose the server with the lowest number
of on-line users. With this approach the Axapta Object Server Environment
can also be made fault tolerant. If an Object Server fails, a client can
immediately connect to one of the other servers in the same cluster.
Axapta object server cluster
The Axapta Object Server cluster environment is build to provide load
balancing and fall back. An Axapta Object Server can be specified to belong
to a specific cluster. If the same cluster name is given for a number of
object servers they all belong to the same cluster. A user can be specified
to connect to a given cluster.
Suppose a number of servers are set up in the same cluster - named AOSC.
They should all use the same application and database, and in other aspects
have the same settings. All clients connecting to the AOSC should be
specified to search for servers belonging to this cluster, otherwise the
load balancing mechanism will not work properly. A client starting up
against an Axapta Object Server Cluster will start out by broadcasting an
UDP package requesting Axapta Object Servers fulfilling names and IP server
masks given in the client settings to respond. It is therefore vital that
firewalls allows such packages to pass through. The client will receive
answers from all Object Servers with information on object server name and
the name of the instance plus the number of clients connected to that
instance. The client disregard information from servers not belonging to the
requested cluster. The client then chooses one of the instances with the
lowest number of clients.
Since a client automatically can choose from all servers in a cluster one or
more Object Servers can be down with out changing the connection procedures.
However performance might suffer severely due to higher load on the fewer
servers.
Setting up the server
On the server manager select the server of interest and click settings. In
the advanced field write -cluster=<my cluster name>. The cluster name can be
up to 10 characters long.
Setting up the client
In the configuration tool choose the configuration of interest. In the
advanced field write -cluster=<my cluster name>. The client setting for
connecting to an object server depends on two situations. The first
situation being both client and Axapta Object Servers being in the same
subnet. The second being client and Axapta Object Servers belong to
different subnets.
Recall the settings in the configuration utility for connecting to an object
server:
* Axapta Object Server Mask
* Axapta Object Server host names
* Axapta Object Server IP Address masks
When the client and Object Servers belong to the same subnet the above three
masks can be left blank.
When the client and Object Servers belong to different subnets the IP
Address masks should contain the mask for the subnet the Object Servers
belong to. An example could be 192.88.253.255, where the last 255 specifies
that the search is done among servers in the subnet 192.88.253.*.
Note: if client at any time receives only service response from Object
Servers within the same cluster it will automatically choose the least
loaded of theese servers without having to specify the cluster name in the
client configuration. This means that if your installation is one single
Axapta cluster, there is no need to change the existing configuration with
respect to cluster name. Just ensure that all relevant Object Servers are
located by client configurations network setup
_____
From: tonychan [mailto:[EMAIL PROTECTED]
Sent: Monday, January 10, 2005 2:54 AM
To: [email protected]
Subject: [development-axapta] Axapta AOS cluster
Hi all,
I try to use 2 AOS and point to same application, and there is a
parameter neet to be placed at the 'Advanced' Field in setting up the
AOS in order to run cluster , anyone can help on the syntax of the
parameter ? Many Thanks.
Best Regards,
Tony.
[Non-text portions of this message have been removed]
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