A system is having a single core, and if there is a single process consuming all the CPU Time, then CPU utilization will show 100% utilization. But in case of multi core systems it is not necessary that all the CPU’s are been used for running all processes. In such cases uneven CPU utilization across …

Linux monitoring is not an easy task for Linux admins. Luckily we have open-source software to monitor these metrics now. Today we are going to learn Linux metrics we can monitor using this monitor bundle Telegraf/Influxdb/Grafana. We can monitor the following metrics with TIG system. Monitor Basic OS metrics For Linux system Monitor Application Metrics …

actimeo is a common NFS mount option in Linux. actimeo=0 can make a big performance difference in the production environment. What does actimeo mean in nfs mount? The “actimeo=0” option means turn attribute caching off. The actimeo option actually makes the time duration the nfs client holds the various cache attributes like “acregmin”,”acregmax”,”acdirmin” and “acdirmax” …

The default password for Cassandra is Cassandra. So we need to change it immediately after we install it. We can use this command to change it. Change default password for Cassandra user # cqlsh `hostname` -u cassandra Password: Connected to xxx at xxx-xxx-xxx-2.localdomain:9042. [cqlsh 5.0.1 | Cassandra 2.2.13 | CQL spec 3.3.1 | Native protocol …

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This article is part of the following series. 6 performance tools you should know in Linux 5 Ways to Check disk size in Linux 4 Ways to Check Disk Partition with Examples in Linux How I Fixed a disk performance issue in Minutes – A Step by Step Guide to Optimize Linux System   High …

Linux command nfsiostat can be used to determine the average Round Trip Time (avg RTT) in milliseconds which is a good measurement for storage performance issue. The nfsiostat command is available in later versions of the nfs-utils package. What does nfsiostat output mean? Understanding nfsiostat command output How to troubleshooting NFS performance? What does nfsiostat …

Troubleshooting a slow network issue on Linux is not an easy task. We are going to dive into this issue with network metrics. Setting up a monitor on each network metric can help us speed up the troubleshooting process. Hope this post can give you more ideas on how to fix a slow network issue …