# How many users a single ondemand instance can support?

**URL:** <https://discourse.openondemand.org/t/how-many-users-a-single-ondemand-instance-can-support/2776>\
**Category:** Get Help\
**Tags:** question\
**Created:** [June 27, 2023, 1:45pm UTC](https://discourse.openondemand.org/t/how-many-users-a-single-ondemand-instance-can-support/2776 "2023-06-27T13:45:12Z")\
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**Author:** ![alanc](https://sea1.discourse-cdn.com/flex015/user_avatar/discourse.openondemand.org/alanc/32/2524_2.png) [@alanc](https://discourse.openondemand.org/u/alanc)\
**Post date:** [June 30, 2023, 7:06pm UTC](https://discourse.openondemand.org/t/how-many-users-a-single-ondemand-instance-can-support/2776/4 "2023-06-30T19:06:15Z")

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Yes, we run 4 production OOD instances (and multiple dev/test instances). Some of our instances regularly support 200+ simultaneous client logins (students in scheduled class times). More details of OSC’s configuration are found in our documentation here:  
[https://osc.github.io/ood-documentation/latest/requirements.html#hardware-requirements](https://osc.github.io/ood-documentation/latest/requirements.html#hardware-requirements)

and here:

> [@Best practices for on demand deployment](https://discourse.openondemand.org/t/best-practices-for-on-demand-deployment/1607/4):
>
> Thanks, the information is really useful. At Georgia Tech, we might expect a class size of more than 300, based on the above the number, we need at least 40GB of memory. Since we have some limitations on VM memory size, I am wondering if any site has experience to running ondemand service in a load banlance mode, e.g. multiple VMs behind the main URL. I understand this is common practice in the Industry world, however in the case, user wants to come back to resum the work, how load banlancer h…

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