David Cao

David Cao

David is a Cloud & DevOps Enthusiast. He has years of experience as a Linux engineer. He had working experience in AMD, EMC. He likes Linux, Python, bash, and more. He is a technical blogger and a Software Engineer. He enjoys sharing his learning and contributing to open-source.

Linux File System: Raw IO and Direct IO

Raw IO and Direct IO are both bypassing file system cache. Here are more details about these two IOs. This can help us understand the difference and troubleshoot easier when we get a file system issue. Difference Between RAW IO…

What is IOwait on Linux

Linux IOwait is a common Linux performance issue. Today we will look at what iowait means and what contributes to this problem. Hope this can give you more ideas about high IOwait issue. IOwait on Linux The iowait column on…

3 Ways to Open a port in Linux

How to open a port on Linux is a common question when testing a firewall-related problem. In this article, we will use nc command and Python code to open a TCP port manually on Linux and check if this port…