The servers in the zone recognize that the data collector has gone down and start the election process. Q.What happens if the Data collector goes down ?Ģ. The member server then updates its information to the data collector via the IMA service. The client then connects to the least loaded server returned by the data collector.Ĥ. Q.What happens when a client connects to a server? (lets say client 1)ġ: The client requests the data collector to resolve the published application to the IP address of the least loaded servers in the farm.Ģ: The Data collector checks what server has the published applications available, and has the least load.ģ. It also check that the data in the LHC is current.Ģ: When the IMA service is the started, it registers with the data collector for the farm and publishes what applications the server is contributing to. The service then downloads the information it needs to initialize. Q.What happens when you add a new server to this farm (lets say server 4)ġ: Server 4 via the IMA service establishes a connection to the data store for the farm.
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Which consists of aĪnd of course we have the users that connect from the wan to the servers. I have setup a basic diagram here, which contains a basic setup in Xenapp.
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Is a protocol that is used for client-to-server connections.Ī local cache of the data store, which allows a server to function in the absence of data store. I ndependent Computing Architecture (ICA) port 1494 Is a service that is used for transferring the background information between Xenapp servers, including server load, current users and connections, and licenses in use. Independent Management Architecture (IMA) port 2512 The XML Broker retrieves this application set from the Independent Management Architecture (IMA) system and returns it to the Web Interface. When a user authenticates to the Web Interface.The XML Broker Receives the user’s credentials from the Web Interface and queries the server farm for a list of published applications that the user has permission to access. The Citrix XML Broker functions as an intermediary between the other servers in the farm and the Web Interface. The Web Interface is where where users access their applications using either Receiver (PNagent service site) or a Web browser. Applications are typically not published on the data collector. Farms determine the data collector based on the election preferences set for a server. When the zone’s data collector fails, a data collector election occurs and another server takes over the data collector functionality. By default, the data collector is configured on the first server when you create the farm, and all other servers configured with the controller server mode have equal rights to become the data collector if the data collector fails. Data collectors relay information to all other data collectors in the farm. Data collectors receive incremental data updates and queries from servers within the zone.
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Each server farm has a single data store.Ī data collector is a server that hosts an in-memory database that maintains dynamic information about the servers in the zone, such as server loads, session status, published applications, users connected, and license usage. The data store is the database where servers store farm static information, such as configuration information about published applications, users, printers, and servers. Multiple zones are necessary only in large farms that span WANs. The fewest number of zones should be implemented, with one being optimal. All farms have at least one zone, even small ones. The data collector maintains all load and session information for the servers in its zone. Data collectors in farms with more than one zone function as communication gateways with the other zone data collectors.
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In large farms with multiple zones, each zone has a server designated as its data collector.
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Lot of services and roles involved, and unless you have done your research it can be troublesome to get the overview you need.So hopefully you will be able to understand a bit more about how xenapp communicates after you have read this post.Ī zone is a grouping of XenApp servers that communicate with a common data collector. Before we prepare for the interview first there are couple of terms that you need to know.