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Monthly Archives: September 2008

Logical Volume Manager and Logical Volumes – Linux

2 Comments Posted by on September 23, 2008

Introduction This post describes what is LVM (Logical Volume Manager) in Linux and how to create Logical volumes. LVM is a higher level layer of abstraction then traditional linux disk and partitions. This allows for greater flexibility in allocating storage. Logical volumes can be resized and moved between physical devices easily. Physical devices can be [...]

Linux System Administration , , , , ,

Simulating the RAID Failure

Leave a Comment Posted by on September 19, 2008

This post is about simulating the failure of software RAID. We change the status of hardware partition as failed and simulate the failure. Here we are using Level 1 raid as explained in by previous post Configuring software RAID (Level 1) on Linux. We are using 2 partitions here /dev/sdb1and /dev/sdb2. We will make /dev/sdb2 [...]

Linux System Administration , ,

Oracle EBS R12 is now certified with 11g Database

3 Comments Posted by on September 18, 2008

Today, Oracle has announced that Oracle E-Business Suite R12 is certified with Oracle database 11g R1, the project I was actively involved into. This announcement for EBS Release 12 version 12.0.4 and up includes: Oracle Database 11gR1 Version 11.1.0.6 Oracle Database 11gR1 Version 11.1.0.6  Real Application Clusters (RAC) Prerequisites & Interoperability For prerequisites and interoperability, [...]

Oracle Application R12, Oracle Database 11g

Configuring software RAID (Level 1) on Linux

4 Comments Posted by on September 17, 2008

Introduction This post is about creating a software RAID using the existing partitions. Usually for RAID device we should use different disk. But here since I don’t have that much hardware available, use partitions to demonstrate the software RAID configuration. There are different level of RAID available. We can create level 0, level 1 and [...]

Linux System Administration , ,

Cron and Anacron – Linux Scheduling Utility

7 Comments Posted by on September 15, 2008

Introduction cron is a scheduling utility used by normal user to schedule recurring events. cron exists for every user. We can place any program of any script which we want to schedule to run periodically in side cron. We can also give the timing information for the script to run. Placing entry in crontab We [...]

Linux System Administration , , , ,

Creating Partition and Filesystem in Linux

1 Comment Posted by on September 13, 2008

Introduction This post describes how to create a partitons in linux and use it. Creating a new partition for use is a 4 step process. You identify a disk and create a partition using fdisk You create a file system on that disk and assign a label You create an entry in /etc/fstab to make [...]

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YUM (Yellow dog Updater, Modifier)

Leave a Comment Posted by on September 12, 2008

Introduction With Redhat Enterprise Linux 5, a new utility has been introduced. This is a work of few programmers from Duke university. Imagine that we have to apply an rpm and we dont have yum. In that case we will start applying the rpm using “rpm” command and it gives a dependency error saying that [...]

Linux System Administration , , ,

Linux Patching Utility – RPM (RedHat Package Manager)

1 Comment Posted by on September 10, 2008

Introduction This post gives a brief introduction about RPM (RedHat Package Manager). rpm is a command line utility installed when the linux OS is installed. rpm exe is located in /bin rpm executable is installed as a part of rpm-4.4.2-47.el5.i386.rpm package. Following are the various options with rpm command. rpm main options rpm -i -> [...]

Linux System Administration , , ,

Protecting GRUB file using MD5 Password Encryption

Leave a Comment Posted by on September 8, 2008

Some times it becomes neccessary to protect the grub.conf with password in order to prevent any user or other system administrator to edit the grub file during reboot. Example during boot up after BIOS initialization it executes the grub file and shows the operating system menus. At this point, if we press “e” then it [...]

Linux System Administration , ,

There are no active responsibilities available for this user – Oracle Apps 11i

3 Comments Posted by on September 1, 2008

Problem Statement : Recently I encountered a problem in Oracle Apps 11i (11.5.9). When a user login into the application he/she gets error “There are no active responsibilities available for this user”and user is not able to see any responsibility in the home page. The problem is same even for sysadmin user. Now the challenge [...]

Oracle Applications 11i ,

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