![]() To use the Cumulative Server Update Installer, follow the steps in the following sections. The front-end servers in an Enterprise Edition pool are organized into upgrade domains. These upgrade domains are subsets of front-end servers in the pool. Upgrade domains are created automatically by Topology Builder. You must upgrade one upgrade domain at a time, and you must upgrade each front-end server in each upgrade domain. ![]() To do this, take one server in an upgrade domain offline, upgrade the server, and then restart it. Then, repeat this process for each server in the upgrade domain. Make sure that you record which upgrade domain and servers that you have upgraded. If you see Busy at least three consecutive times after you wait 10 minutes in between each attempt, or if you see any result of InsufficientActiveFrontEnds for the State value of the pool, there is an issue that affects the pool. ![]() If you cannot resolve this issue, you may have to contact Microsoft Support. If this pool is paired with another front-end pool in a disaster recovery topology, you must fail over the pool to the backup pool, and then update these servers in this pool.įor more information about how to fail over a pool, go to the following Microsoft website. The Get-CsPoolUpgradeReadinessState cmdlet also returns information about the upgrade domains in the pool, and about which front-end servers are in each upgrade domain. If the ReadyforUpgrade value for the upgrade domain that contains the server that you want to upgrade is True, you can upgrade the server. Run the Cumulative Server Update Installer by using the UI or by using a command to upgrade the front-end servers that are associated with an upgrade domain. Note If you upgrade or update front-end servers during scheduled server downtime, you can run the cmdlet in step 2 without the -Graceful parameter. More specifically, run the cmdlet as Stop-CsWindowsService. This action immediately shuts down services, and the server does not wait until each existing service request is fulfilled. Note The UI provides a clear indication of which updates are installed when you click Install Updates.
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