Hi Nilotpal,

Yes, you will need cookie stickiness. And you also need to make sure the Cookie timeout is greater than the session timeout.

Please note that PowerServer itself does not provide the cluster function and there is no configuration required on PowerServer., and the cluster does not supports fail over. So you need to use a third-party tool (for example, Nginx, K8S, etc.) to implement it.

We have tested with Nginx. The cluster works well via ip-hash load balancing. Please refer to the article below for HTTP Load Balancing of Nginx.
http://nginx.org/en/docs/http/load_balancing.html

Regards,
ZhaoKai