Even if you try to create a highly available RDS infrastructure, there will always be a time when your server will slow down (because of a user or a greedy process, for example) or simply because there are still many inactive sessions on your host session server.
In these sessions, there may be programs that run for nothing for several hours and that could have been automatically closed by your server if you had specified inactivity timeouts for your users' sessions.
In the properties of each RDS collection, you will find a "Session" tab that will allow you to :
Then, in the case of a disconnection or when one of the limits is reached, you will be able to choose to :
If you use multiple session host servers per collection, you will be able to manage load balancing on them in the properties of the desired collection.
In the "Load balancing" tab, you will see the list of session host servers assigned to this collection and you can specify :
In summary, if the 1st RDS server has a relative weight of 1000 and the 2nd has a relative weight of 100, the 1st will support 10 times more sessions than the 2nd server. +
Source : Aide sur paramétrage RDS Equilibrage de charges - Pondération Relative & Limite de session (Technet Microsoft)
To simply limit the use of resources on your server, you can also check and limit the redirection of client resources to remove what is not needed in your case.
For example : depending on the needs of your users, redirection of audio/video playback and smart card readers may not be necessary.
By disabling these redirects, you will prevent your server from using resources unnecessarily for each connected user.
This can become very significant if you have many users.
To find out if a server is full, you can enable performance alerts.
In the event that a program consumes a lot of resources or that almost all the resources of the server are used, you could be notified and be able to close the affected processes on the relevant user sessions before it's too late.
To do this, go to "Remote Desktop Services -> Servers" and select your RDS server.
Then, go down to the "Performance" section where you will see your RDS server appear.
Click "Tasks -> Configure Performance Alerts".
Note that the server shown here is the one selected above.
Specfify from when you want to be alerted :
For this to work, remember to enable performance counters by right-clicking "Start Performance Counters".
Windows Server will warn you that you will need at least 30 minutes to start seeing information here.
In addition, the meter status will be : On - Waiting for data.
Finally, if you have installed an RDS gateway to provide secure external access to your RDS infrastructure, be aware that it's also possible to limit the number of simultaneous connections to this gateway.
To do this, open the RD Gateway Manager and right-click "Properties" on it.
Then, in the "General" tab, you will be able to manage the maximum number of connections to allow on this RDS gateway.
Another possibility that can be complementary is to create an RDS gateway server farm to distribute the connections (via NLB) on the different servers and thus distribute the workload on these different servers.
Windows Server 1/3/2020
Windows Server 3/8/2019
Windows Server 5/31/2019
Windows Server 4/19/2019
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