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…
How to Check if a Disk is Busy in Linux
This article is part of the following series. Disk utilization in iostat command is a key metric to check…
Understanding Maxdepth Mindepth Depth In Linux Find Command
Find command on Linux is a very powerful tool to search files or directories. We can use maxdepth/mindepth to limit…
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…
Check DNS Records with Examples – PTR MX SRV CNAME AAAA
DNS is a very critical part of the Linux operation world. We will cover the most common DNS records today.…
4 ways to Check DNS Record with dig Command in Linux
The most efficient way to check DNS records in Linux is using dig command. This command will send the DNS…
4 Commands to Check HBA WWN WWNN WWPN on Linux
How to get HBA WWPN on Linux is a common task for a storage engineer. We need the WWPN to…
How to Find disk SCSI ID WWIDS In Linux
On Linux disk SCSI ID uniquely identifies each SCSI device on the SCSI bus. A unique SCSI ID is generated…
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…
Linux Tcpdump: Filter ipv6 ntp ping packets
Tcpdump is a very powerful Linux command to capture packets. We collect the following tcpdump command examples to help you…