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what i understood is redis is needed fo multi-node setup. I f we have multiple livkeit server nodes ..bt what is the use of it in livekit in multinides

It is used for the nodes to communicate things like rooms created and participants connected, also to communicate with Egress and Ingress services. It is never used to send audio/video data, tracks are sent using webrtc only

what is pub/sub used for then ??

Pub/sub is used for communication: https://github.com/livekit/psrpc Single node LiveKit does not need redis unless you want to use the Egress or Ingress services

Thanks for the reply