A method, system, and storage medium for collecting bandwidth data is provided. The method includes producing master and slave text files in response to simultaneous collection of data samples from a network device by servers. The method also includes generating a clean data file by sorting data in the master and slave text files by the network device port, sorting data samples for the port by collection time, and for each of the samples: adding a designated interval of time to a time on the network device resulting in a target network device time whereby the time on the network device corresponds to a time the data sample was collected, examining data samples in the master and slave text files corresponding to the time the respective data samples were collected, selecting from one of the master and slave text files the sample with a collection time most closely matching the target network device time, and storing the selected sample in the clean data file.