Compression is useful even with directly attached storage devices. Disk IO is still slower than compression throughput unless you are running very fast storage.

Compression is useful even with directly attached storage devices. Disk IO is still slower than compression throughput unless you are running very fast storage. If your workload is IO-bound, then it is quite likely that compression will help. Most people, on their personal machines, would likely see IO performance “improve” with filesystem level compression.