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If your SUS server machines is running additional services or the available network capacity is less than the server network card capacity, you will need to adjust this guidance to reflect your situation.There are essentially three options, depending on the number of Windows XP systems to be updated using your SUS server (if you have one or a few SUS servers) and the topology of your SUS implementation (if you have many SUS servers): For the first (no action necessary) option, it is recommended that the SUS administrator monitor the server load when the update is first approved and for the first hour of the work day or first work shift after the Windows XP SP2 update has been approved.It is also recommended that you plan your Windows XP SP2 deployment so it doesn’t overlap with the deployment of the monthly security updates from Microsoft (released on the 2nd Tuesday of each month) to eliminate the need to factor in the impact of the deployment of these updates on server load and therefore on the lengths of the approval windows for the Windows XP SP2 deployment.
SUS administrators can use the following formula to calculate the amount of time for which to approve the Windows XP SP2 update on each day: TA = Amount of time (in hours) the update needs to be marked as ‘approved’ on a given day NXP = Number of Windows XP systems to get SP2 via the SUS server NDE = Number of days since SP2 was first marked as approved on the SUS server For example, if there are 12000 Windows XP systems that need to get the Windows XP SP2 update via a SUS server, the calculation would work out as follows: For day 1, the update would need to be marked as approved for 2 hours, since Note: An important consideration for using this technique is to initiate the approval about 1 hour after the work day or shift starts, so the SUS server is not impacted by the spike in clients trying to download SP2 soon after they are turned on.
For the standard SUS machine (P700, 512 MB RAM, 100 Mbps network card), set the maximum concurrent connections to 100 and the maximum bandwidth for the SUS Web site to 80 Mbps.
In this example, the value of 100 for maximum concurrent connections is an estimate for what the server machine can handle under heavy data transfer load conditions, given its CPU and memory capacity.
Note: The above formula is based on conservative assumptions to account for potential spikes in the number of clients contacting the server during the approval window.
Using this technique, it is estimated that between 10 SUS client machines will get the Windows XP SP2 update per day.