Setting Kernel parameters permanently in Red hat Enterprise Linux Every time the system boots, the ‘/etc/rc.d/rc.sysinit‘ script is executed by init process. This shell script contains a call to sysctl command and reads the values from /etc/sysctl.conf file as the ones to be set Therefore, any...
There are two primary modes of operation of the microprocessor architecture: Long mode (lm) and Legacy mode. Long mode is used by 64-bit operating systems. It combines the processor’s native 64-bit mode and a 32-bit/16-bit compatibility mode. Under this mode, 64-bit, 32-bit and 16-bit applications may...
EMail Posts / Linux Admin / Redhat Linux Kernel / Unix Intermediate
by Ramdev · Published December 6, 2021
1. How Do I Load a Kernel Module on System Start-up? ( RHEL5/6) 2. What is the technical differences between a normal SMP kernel and a hugemem kernel? 3. How to specify a ‘default’ boot kernel type for a RHEL? 4. How to update RHEL kernel ?...
EMail Posts / Linux Admin / Redhat Enterprise Linux 6 / Redhat Linux Kernel
by Ramdev · Published July 23, 2021
What is the meaning of a Linux System Crash? Crash is a generic term used usually to say that the system has come to halt and no progress is observed. The system seems unresponsive or has already rebooted. Kernel Panic – A voluntary halt to...
HP Hardware / Information Centers / Linux Admin / Linux Booting / Linux Disk Management / Linux LVM / Linux Networking / Linux Performance / Linux Troubleshooting / Linux YUM/RPM / Performance Analysis / Redhat Clusters / Redhat Enterprise Linux 6 / Redhat Linux Kernel / RHEL Commands / RHEL Configuration Files / RHEL LDAP / RHEL Migrations / Rhel6 Storage / RHEL7 / Site Reference / Sticky posts / Ubuntu
by Ramdev · Published September 1, 2015 · Last modified September 19, 2019
Booting Tasks Read – Unexpected Server Reboots of RHEL servers on HP Read – Linux Admin Reference – RedHat Linux Grub Loader Storage Responsibilities Read – Understand Device Mapper and DM-Multipath Read – Identifying Disk Errors in Linux Read – Identify if linux was installed on...
Linux Admin / Redhat Enterprise Linux 6 / Redhat Linux Kernel
by Ramdev · Published September 30, 2013 · Last modified July 23, 2016
This is continuation post to our earlier kernel panic reference post ( Redhat Enterprise Linux 6 – Kernel Panic and System Crash – Troubleshooting Quick Reference ) where we have discussed several types of kernel panic issues and their reasons. And in this post I will be...
Blog for Unix Admin / Linux Troubleshooting / Redhat Linux Kernel
by Ramdev · Published March 17, 2022
There are numerous occasions when a crash dump can be a valuable source of information when troubleshooting a system. The most common times are a system hang or a system panic. Under Solaris[TM] on both SPARC(R) and x86 platforms, the mechanisms for getting a crash dump...
Linux Admin / Linux Performance / Redhat Enterprise Linux 6 / Redhat Linux Kernel / Unix Intermediate
by Ramdev · Published April 3, 2021
What is Page cache ? When a user process reads or writes a file, it is actually modifying a copy of that file in main memory. The kernel creates that copy from the disk and writes back changes to it when necessary. The memory taken up...
Blog for Unix Admin / Linux Troubleshooting / Redhat Linux Kernel
by Ramdev · Published May 3, 2011 · Last modified August 5, 2016
The internal state of a kernel based on Unix can provide valuable information on current system state. If a user process, or the kernel, is hanging, then the more information that can be gathered at that point, the greater the chance of a good diagnosis. Under...
Linux Admin / Linux Networking / Redhat Linux Kernel
by Ramdev · Published March 25, 2014 · Last modified July 2, 2015
This article will introduce several Tunable Parameters, that we can customize for Network Tuning purpose in Redhat Enterprise Linux.
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