Number of robots that can be attached to a single orchestrator

How many attended/unattended bots can work via one single orchestrator concurrently? People want to know when is the time that they need to purchase a second orchestrator due to the limitation of capacity of a single orchestrator in job handling.

Someone says in theory 20,000 and in practice, somebody tested with 2,000 and it worked.
Is that true? If it is, could you please provide me with open official document generated by UiPath? That will hopefully include the followings:

the specification of the server computer,
the number of robots connected to one orchestrator,
the specification of the robot computer,
the type of job that robots did concurrently.

Thank you.


Theoretically, it’s infinite, but UiPath studies have shown that more than 100 bots running simultaneously has diminishing returns in terms of performance if only using one instance of Orchestrator.

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Also keep in mind that you can install the orchestrator in multi-node mode if your needs become more intensive…

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There is a lot of variability to consider but I think the largest costs would be the Robot licensing along with any Infrastructure and non-uipath OS/software licensing and not a single Orchestrator environment

UiPath makes recommendations for their hardware requirements at scale as well as suggestions on how to handle performance dips due to volume of robots such as reducing the typing of logging or adjusting the buffer size, but that is more on the database and connection pool then the Orchestrator Web Server.

As @bcorrea mention you can setup Orchestrator in a multi-node high-availability setup.

To my knowledge there is no additional charge on the UiPath side (in an Enterprise setup) as it is considered one production environment so the additional fees would be on the infrastructure hardware (machine hosts, load-balancers, etc. and licensing on the OS (Microsoft) along with. In the SaaS model form UiPath you are not paying for Orchestrator but rather a slight higher costs for the robot licenses.

There are also requirements for the Robots; however this largely depends on the processes that you are going to be automating and the applications in that process (Something that is going to only be automating a basic web application is vastly different from something that might be CPU or memory intensive), whether you are showing standard desktops/VMs running Windows 10 or host with Windows Server and if that Server is going to be configured with RDS/Terminal Services which has additional licensing costs from Microsoft.

Your best bet her is to size your hosts appropriately for the tasks that they will be handling and whether it will be a 1:1 machine/robot or 1:many machine/robot ratio.

I would suggest reaching out to UiPath directly and speak with one of their Pre-Technical sales reps to better understand the technical requirements and how that affects the pricing.

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Direct from UiPath:

One single Orchestrator instance can simultaneously run up to 1,000 Unattended robots or up to 10,000 Attended ones.

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