is there any limitation on disk size for storing segmentation or can we store lots of segments in our system based on disk space availability

yes, it’s bounded by the pinot server disk size. Pinot server requires data loaded on the server to be queried

how to configure pinot server disk size for each machine

It will use the file path you configured. How do you configure the disk in your environment

controller.helix.cluster.name=pinot-labtest controller.port=9000 controller.data.dir=/data/pinot/backup controller.local.temp.dir=/tmp/pinot-tmp-data/ is it correct configuration?

Yes .