Downloading a massive file over the internet consumes unnecessary bandwidth and can be restricted by data caps. If you need a file solely for local storage or internal network testing, generating one on your machine is fast, safe, and efficient. On Windows (Command Prompt)
Run the following command (Note: 53,687,091,200 is 50 GB in bytes): fsutil file createnew testfile_50g.dat 53687091200 Use code with caution. Linux & macOS (Terminal) 50 gb test file
discusses the CoBlitz system, exploring the performance loss that occurs when serving large files (which can evict thousands of small files from in-memory caches) and how to optimize distribution at scale. Distributed File System Scalability : Research on the Andrew File System Downloading a massive file over the internet consumes
Note the initial speed versus the speed after 10 to 15 seconds. If a drive starts at 3,500 MB/s and plummets to 500 MB/s, you have successfully mapped the boundary of the drive's high-speed SLC cache. Local Network (LAN) Throughput Testing Linux & macOS (Terminal) discusses the CoBlitz system,
How to create a 50 GB test file (conceptual overview)
Creating a 50GB file with dd will take some time, as it involves actual I/O operations to write all that data to disk.