The Power Control Service (PCS) and Cray Advanced Platform Monitoring and Control (CAPMC) cannot handle large requests. The maximum number of nodes in a single request is approximately 2500 nodes.
When the request is too large cray power will return the following message.
Error: Internal Server Error: etcdserver: request is too large
The logs for the cray-power-control pods will contain text like the following.
level=error msg="etcdserver: request too large" func="github.com/Cray-HPE/hps-power-control/internal/storage.("ETCDStorage).TASTransiation" file="/go/src/github.com/Cray-HPE/hps-power-control/internal/storage etcd impl.go:520"
Reduce the number of nodes in each request by running multiple cray power or cray capmc commands.