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Install the Cumulative Updates in the SharePoint Farm. After downloading the latest updates and taking the necessary precautions, you are ready to install them in your SharePoint farm. First, install the language independent update: The update will take a few minutes, depending on your server capabilities.
One additional advantage of this installation process ensures that the SharePoint farm is installed with the latest updates, leaving the SharePoint farm updated and working properly (if you want to learn how to install a SharePoint 2019 farm in an automated way, click here and here).
Can a Windows Update automatically update a SharePoint Server?
If you have windows update enabled or WSUS configured to push SharePoint fixes automatically to your SharePoint farms it will guarantee that your SharePoint servers will always be up-to-date.
The only thing you need to plan is to run PSConfig from time to time to ensure that not only the binaries or your box but also the SharePoint databases get updated. A caveat is that evaluating the fix in a test environment before applying it on the production farm will be more complicated. If you have windows update disabled nothing changes.
We are planning to install CU updates on 20 SharePoint Servers and I was wondering what would be the fast and recommend way (Best Practices) to install the update? In other words, would it be fine if I install the CU update on all servers first (in parallel) and then run the configuration wizard one server at a time (in serial?
How to install an update on a farm server?
Install the update on the farm servers. Perform a build-to-build upgrade to complete the patching process. During the update phase, the farm can continue to be in production with minimal downtime. However, during the build-to-build upgrade phase, the farm will be unavailable.