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In a installation of WebSphere Application Server with Network Deployment, a node is:
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A cell provides a way to group one or more nodes of your WebSphere Application Server Network Deployment product. You define the nodes that make up a cell, according to the specific criteria that make sense in your organizational environment.
WebSphere Application Server Network Deployment provides a flexible, secure server runtime environment for large-scale and mission-critical application deployments. It is available on premises or for public, private, or hybrid cloud.
Nodes can be managed or unmanaged. An unmanaged node does not have a node agent or administrative agent to manage its servers, whereas a managed node does. Both application servers and supported web servers can be on unmanaged or managed nodes. A stand-alone application server is an unmanaged node.
The syncNode command forces a configuration synchronization to occur between the node and the deployment manager for the cell in which the node is configured. The node agent server runs a configuration synchronization service that keeps the node configuration synchronized with the master cell configuration.
Basically,
A server is a runtime environment, a process of execution.
A node is a grouping of servers that share common configuration. It is a physical machine.
A cell is a grouping of nodes into a sigle administrative domain. For websphere, it mean that if you group several servers within a cell, then you can administer them with one Websphere admin console
Hope this helps!
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@ggasp Here is what I got off IBM's Information Center
A node is a logical grouping of managed servers.
A node usually corresponds to a logical or physical computer system with a distinct IP host address. Nodes cannot span multiple computers.
http://publib.boulder.ibm.com/infocenter/wasinfo/v6r1/index.jsp?topic=/com.ibm.websphere.nd.multiplatform.doc/info/ae/ae/cagt_node.html
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