Category: Redhat Linux Kernel

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Linux Admin Troubleshooting Reference – Kernel Panic and System Crash – Redhat Enterprise Linux (RHEL6)

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...

Linux Administration Information Center

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...

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How to set kernel parameters in Redhat Enterprise Linux and Suse Linux

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...

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Linux Admin Reference – 32bit mode vs 64bit mode – Redhat Enterprise Linux

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...

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Redhat Enterprise Linux – Troubleshooting Kernel Panic issues – Part 2

    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...

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Understanding Linux Hugepages

Before we discuss about Huge pages, we should revise some of the basic concepts about Operating system memory management. Operating systems basically deals with two types of memory for its operations one is Physical memory ( actual Physical RAM) and the second is Virtual memory ( combination of Physical...

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RHEL : Examining Red Hat Linux kernel state using Sysrq key combinations

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...

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