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…
This article is part of the following series. Disk utilization in iostat command is a key metric to check if a disk is busy or not in Linux. It is used to calculate the time percent that a disk…
Find command on Linux is a very powerful tool to search files or directories. We can use maxdepth/mindepth to limit down the search to specific depth levels. How to Use Depth In Find Command We can combine two options together…
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…
DNS is a very critical part of the Linux operation world. We will cover the most common DNS records today. All domains are required to have at least a few essential DNS records for a user to be able to…
The most efficient way to check DNS records in Linux is using dig command. This command will send the DNS query to the name servers listed in the resolver(). It allows you to query information about various DNS records, including…
How to get HBA WWPN on Linux is a common task for a storage engineer. We need the WWPN to configure zone on the switch side.We will look at this question today. In our SAN environment, we have two HBAs…
On Linux disk SCSI ID uniquely identifies each SCSI device on the SCSI bus. A unique SCSI ID is generated when a scsi disk is added to Linux system. SCSI ID can be used for representing a disk in the…
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…
Tcpdump is a very powerful Linux command to capture packets. We collect the following tcpdump command examples to help you quickly filter the packets you need. How to filter ipv6 ntp ping packets with tcpdump? Related Posts: 20 Advanced Tcpdump…
