Blog for Unix Admin / Linux Admin / Linux Performance
by Ramdev · Published June 18, 2011 · Last modified July 2, 2015
To modify kernel parameters a common way is to change /proc file system: 1. Log in as root user. 2. Change to the /proc/sys/kernel directory. 3. echo <desired list of values> > <group of parameters> But this update is not permanent and after system reboot, your...
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...
Installing required packages RHEL 5 has the Kdump packages installed by default. If for any reason they are not installed, you need to install the packages “kexec-tools-.rpm” and “system-config-kdump-.rpm” with the following commands: # rpm -ivh kexec-tools-.rpm system-config-kdump-.rpm or, if your system is registered at...
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...
This problem is not common to all the versions and releases but specific to the released of Solaris 8 and 9 ( I am not able to get those number clearly to mention here)
This article will help you to configure RSC console for SUN based machines .. To use the RSC card the system administrator needs to redirect the console to the RSC. Certain faults are undiagnosable if the console log at the time of failure is not captured....
Beginners Lessons / Blog for Unix Admin / SAN Basics for Unix Admin / Solaris Admin / Storage Configs for Unixadmin
by Ramdev · Published August 20, 2021
In conventional IT systems, storage devices are connected to servers by means of SCSI cables. The idea behind storage networks is that these SCSI cables are replaced by a network, which is installed in addition to the existing LAN. Server and storage devices can exchange data...
Blog for Unix Admin / Solaris Admin / Storage Configs for Unixadmin / Veritas Administration for unixadmin
by Ramdev · Published May 4, 2021
Here you go with the procedure to configure SAN ( EMC ) storage with native multipathing and veritas volume manager. You dont need to go with complete procedure in a single read, because it has different tasks involved and the procedure was well implemented on...
Solaris Admin / Storage Configs for Unixadmin / Unix Intermediate / VxVM Learning / VxVM Migrations
by Ramdev · Published September 26, 2021
This is a following post for my previous SAN migration post Solaris host level SAN migration (with SVM) from Clariion to VMAX. As discussed earlier in my previous post, many organisations started migrating their Server storage from Old legacy SAN devices ( e.g. EMC Clariion )...
Blog for Unix Admin / Solaris Admin / Storage Configs for Unixadmin
by Ramdev · Published November 24, 2011 · Last modified July 2, 2015
Enterprise Unix system administrators will always have two challenges, every day, to deal with … the first one is providing sufficient Computing resources for the business applications and the second one is providing sufficient storage for the business applications. We will discuss about managing computing resources( CPU...
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