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HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Update Services\Server\Setup\IIsDynamicCompression Xpress encoding is enabled in IIS nfig with this line under the element and a registry setting:
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It implements compression on update metadata, and can result in significant bandwidth savings. WSUS uses a compression type calls Xpress encoding. Check whether compression is enabled (if you want to conserve bandwidth) In an environment that has around 17,000 updates cached, more than 24 GB of memory may be needed as the cache is built until it stabilizes (at around 14 GB). :::image type="content" source="media/windows-server-update-services-best-practices/advanced-settings.png" alt-text="Screenshot of the settings in the Advanced Settings window."::: Setting nameĠ (unlimited, up from the default of 1,843,200 KB)Ġ (to prevent a recycle, and modified from the default of 1740)
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For more information, see Plan for software updates in Configuration Manager. Here's a summary of recommended changes, and a related screenshot. These settings are found in IIS Manager > Application Pools > choose WsusPool and then click the Advanced Settings link in the right side pane of IIS manager. IIS implements an automatic recycling of the application pool every 29 hours, Ping, and Idle Time-outs, all which should be disabled. We recommend that you increase the default Queue Length, and disable both the Virtual and Private Memory Limit by setting them to 0. And clients will receive errors when you make scan requests, such as HTTP 503 errors. But if you end up in a scan storm scenario, the pool will recycle constantly. It isn't a large problem when clients are undergoing delta scans.
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When the pool recycles, the cache is removed and must be rebuilt. It can cause the IIS application pool that hosts WSUS (known as WSUSPool) to recycle when WSUSPool overruns the default private and virtual memory limits. This operation is expensive and very memory intensive. WSUS implements an internal cache that retrieves the update metadata from the database. Disable recycling and configure memory limits The Update Agent does cache the data, and the next scan requests will return the data from the client cache. The metadata returned will usually be less than when the scan is initiated by Configuration Manager. When the Automatic Updates Agent scans, or you select Check for Updates in Control Panel, the agent sends criteria to retrieve only those updates Approved for Install. Configuration Manager, because it includes compliance checking, requests scans with criteria that will return all updates that are in any status except declined. The load increases aren't the large penalty you pay for switching databases.Ĭonfiguration Manager client scans put more demand on WSUS than the stand-alone Automatic Updates.
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Sharing a database means when a client switches to another WSUS instance that uses the same DB, the scan penalty isn't incurred. And clients retry repeatedly in this case. It can generate enough load to cause errors when clients communicate with a WSUS instance. Transfers of greater than 1 GB per client may occur in these scenarios, especially if the WSUS server isn't maintained correctly.
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A full scan can cause large metadata transfers. If clients change to a different WSUS server that uses a different database, they must do a full scan. WSUS tracks activity in the database, so that both know what has changed since a client last scanned and will only send metadata that's updated since then. The shared database scenario also prevents a scan storm.Ī scan storm can occur when many clients change WSUS servers and the servers don't share a database. If one server goes down, it won't immediately spoil your weekend because no client can update while you must be updated against the latest zero-day exploit. Instead, consider using a configuration of 2-4 servers sharing the same SQL Server database. Original KB number: 4490414 Capacity limitsĪlthough WSUS can support 100,000 clients per server ( 150,000 clients when you use Configuration Manager), we don't recommend approaching this limit.
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Original product version: Configuration Manager (current branch), Windows Server Update Services This article provides tips for avoiding configurations that experience poor performance because of design or configuration limitations in WSUS. Windows Server Update Services best practices
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