Category: Redhat Enterprise Linux 6

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‘cat’: Concatenate and write files – Linux Command

‘cat’ copies each FILE (‘-‘ means standard input), or standard input if none are given, to standard output.  Synopsis:      cat [OPTION] [FILE]… The program accepts the following options.  ‘-A’ | ‘–show-all’                 Equivalent to ‘-vET’. ‘-b’ | ‘–number-nonblank’    Number all nonempty output lines, starting with 1....

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Storage Configuration information Center

  Read – SAN Guide for Beginners Read – SAN Storage Responsibilities for Enterprise System Administrators Read – Pre-Planning/Pre-work required for Storage Migrations in Unix. Read – SCSI Guide for Beginners Read – EMC Power Path commands for system administrators Read – Determine WWN for HBA...

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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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Beginners Information Center

Career Guidance Ten Technical points that every system admin should know when joining into a new team Savings Plan for System Admin – It’s about Time, not Money Quick Career Tip of this Week – have 100% complete LinkedIn Profile Careers in Computer Networking & System...

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RHEL LVM : How to recover a deleted Logical volume in RHEL 5/6

In this post, you can find the procedure to recover a deleted logical volume, from the linux server  with below configuration. Server Name :  GURKULRHEL Version          :  Redhat Enterprise Linux 6 LVM Configuraiton:                 VG NAME...

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RHEL7 – How to disable transparent hugepages (THP)

Method 1: Create a customized tuned profile with disabled THP Step 1: Initially, we should create a customized version of the currently running profile. The customized version will disable THP. Find out which profile is active, create a copy. In the following example we currently use the...

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Configuring Kdump to troubleshoot kernel crashes, hangs, or reboots in RHEL5/RHEL6/RHEL7

  How Kdump works? Using the kdump service and the kexec command, you can ensure faster boot up and creation of reliable kernel (vmcores) for diagnostic purposes. First of all let us understand these two basic components: • kexec:  The kexec command is a fast boot mechanism...

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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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Linux Admin Reference – NTP Configuration and Troubleshooting – Red Hat Enterprise Linux :

NTP stands for Network Time Protocol, and it is an Internet protocol used to synchronize the clocks of computers to some time reference. NTP is an Internet standard protocol originally developed by Professor David L. Mills at the University of Delaware. Time usually just advances. If you have communicating programs running on different computers, time still...

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