Independent Management Architecture in Software

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Independent Management Architecture
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Data Transmitted (approximate) 115KB 092KB 11KB 066KB
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Table 3-1 Citrix Presentation Server 40 Sharing Load Information
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Bandwidth of Data Collector Communication
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To maintain consistent information between zones, data collectors must relay information to all other data collectors in a farm The tables on the following pages illustrate the impact to network traffic Tables 3-1 and 3-2 list the amount of data transmitted for session-based events Each time these events occur, the member server sends data to the zone s data collector, which sends data to all other data collectors in the farm Table 3-3 lists the amount of data sent by one data collector to another when operations are performed by the Presentation Server Console on servers that reside in different zones Limit the use of zones to avoid the cost associated with the replication of zone data
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The bandwidth consumed when you publish an application varies, depending on the number of servers in the server farm In general, the amount of bandwidth consumed
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Table 3-2 Citrix Presentation Server 40 not Sharing Load Information
Citrix Access Suite 4 Advanced Concepts: The Official Guide
Event Presentation Server Console server query Application publishing Changing a ZDC
Data Transmitted (approximate) 61KB 378KB 123KB
Table 3-3 Citrix Presentation Server 40
increases 466 bytes for every additional server in the server farm Starting a new server generates the most amount of traffic to the other data collectors Starting a new server generates about 56KB worth of traffic to the data collector in a default configuration NOTE You can use a third-party solution to dedicate a pipe for IMA traffic, which uses port 2512 by default, to avoid flooding the network in WAN environments
Application of IMA Bandwidth Formulas
When a Presentation Server is booted, it must initialize the IMA Service during startup and it must also register with the data collector for the zone in which it resides Figure 3-1 shows the steps for an initial boot of a Citrix Presentation Server Farm NOTE License communication is not included in this slide
Communication occurs in the following sequence of events: 1 The IMA Service establishes a connection to the data store for the farm The IMA Service then downloads the information it needs to initialize It also makes sure the data contained in its local host cache is current 2 After The IMA Service is initialized, the member server registers with the data collector for the zone This is a function of the number of published applications the server is contributing to 3 The data collector needs to relay all of the updated information written by the member servers in the zone to all other data collectors in the farm to keep them in sync with each other The data collector-to-data collector updates are a function of the amount of information updated by the member server The data collectors only replicate the delta, or items that have changed; they do not replicate all their tables every time an update is sent
3:
Independent Management Architecture
Zone 1
Data store
Zone 2 KB read = 436 +(315*(Srv 1)) KB read = 436 +(315*(Srv 1)) KB read = 436 +(315*(Srv 1))
KB read = 436 +(315*(Srv 1))
KB read = 436 +(315*(Srv 1)) KB read = 436 +(315*(Srv 1))
KB = 62 +(05*Apps)
Data collector KB = 56 +(03*Apps)
KB = 56 +(03*Apps)
Data collector KB = 56 +(03*Apps)
KB = 56 +(03*Apps)
Member server Member server
Member server Member server
Figure 3-1 Initial boot of a Citrix Presentation Server farm
NOTE In the example in Figure 3-2, there are only two zones, so the data collector must only replicate the updates it receives from the member servers once to the other data collector If there were 3 zones, the data collector would have to replicate the same information twice This causes higher bandwidth consumption and places a higher load on the data collectors in the farm
Idle Farm Communication
IMA must use a small amount of overhead, even if the farm is idle Figure 3-2 shows the communication that must take place on a farm after it is initialized This communication has 3 primary components: an IMA coherency check between the member server s local host cache and the data store, an IMA Ping by the ZDC to the member servers in its zone, and an IMA Ping to the other ZDCs in the farm
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