Author: Ramdev

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Is your Redhat Linux Environment ready for Leap Second Insertion on Jun 30, 2015 ?

What is a Leap Second? A leap second is a second which is added to Coordinated Universal Time (UTC) in order to synchronize atomic clocks with astronomical time to within 0.9 seconds.A leap second is added (can be removed but this never actually happens in reality) on the...

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Solaris 11 Administration Information Center

Read – How to Administrate IPQoS Read Command Cheat Sheet : Managing Services Read Command Cheat Sheet – Image Packaging System Read Command Cheat Sheet – Installation and Deployment Read Command Cheat Sheet – Basic Adminsitration Read – Monitoring System Activities using sar in Solaris Read...

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Linux Admin Reference – SUDO Configuration in RedHat Enterprise Linux

Sudo is different from the su command and is more flexible and more secure. The sudo command allows users to do tasks on a Red Hat Enterprise Linux system as another user. One significant advantage is that it can log usage. By default the program saves...

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Redhat Enterprise Linux Networking Troubleshooting – Quick Reference

  1. Network does not start due to “Device not managed by Network-Manager” error. Generally, this error occurs when the ethernet cable does not connect to the interface well and the interface is not configured properly. The solution for this issue is to ensure the link...

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VxVM : Re-adding a failed boot disk – incase of correctable errors

  Re-adding a disk is same procedure as replacing a failed disk, except we use same disk. We have to detach the disk  from vxvm, so that the VxVM will detect the disk failure and will cease access to the failed disk.  You can then perform...

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Solaris Troubleshooting : recover hung System Controller [ Sun Fire v1280, E2900, 3800, 4800, 4810, 6800, E4900, E6900, and Netra 1280, 1290 Server ]

When a system controller (SC) is hung, try a few steps before pressing the Reset button on the SC. Step 1 . Try to Telnet or directly connect to the serial port of the “hung” SC, TIP into the platform shell, and use the “reboot” command....

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VCS : Configure GAB manually

    VCS uses the Group Membership Services/Atomic Broadcast (GAB) protocol for cluster membership and reliable cluster communications. GAB has two major functions. It handles the following tasks: Cluster membership Cluster communications       To configure GAB Set up an /etc/gabtab configuration file on each...

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