Cassandra is an open source distributed database management system. It was initially developed by Facebook for storing very large amounts of data. Jeff Hammerbacher, who led the Facebook Data team at the time, has described Cassandra as a BigTable data model running on a Amazon Dynamo-like infrastructure. » Read more: Cassandra: Structured Key-Value based storage system
Archive for the ‘Open Source’ category
Cassandra: Structured Key-Value based storage system
December 11th, 2009Fedora-12 released and whats new
November 18th, 2009Fedora is a leading edge, free and open source operating system that continues to deliver innovative features to many users, with a new release about every six months. Fedora-12 have several major new features with special focus on desktops, netbooks, virtualization and system administration. The most important features are:
Virtualization improvements – Not content with all the improvements in Fedora 11, the project have kicked virtualization based on KVM up another notch in Fedora 12. » Read more: Fedora-12 released and whats new
ZFS comes with built-in deduplication
November 3rd, 2009Sun’s ZFS now has built-in deduplication utilizing a master hash function to map duplicate blocks of data to a single block instead of storing multiple times.
What’s deduplication?
Deduplication is the process of eliminating duplicate copies of data and mapping duplicate blocks of data to a single one instead of multiples. When data is highly replicated, which is typical of backup servers, virtual machine images, and source code repositories, deduplication can reduce space consumption not just by percentages, but by multiples.
» Read more: ZFS comes with built-in deduplication
Ubuntu 9.10 Desktop Edition Released
October 30th, 2009This new release comes with GIMP 2.6, GNOME 2.28/KDE 4.3.2, Mozilla Firefox 3.5, OpenOffice.org 3.1, Linux kernel 2.6.31, X.Org 7.5, and the Empathy Instant Messenger instead of Pidgin. The Ubuntu One client, which interfaces with Canonical’s new online storage system, is installed by default. It also debuts a new application called the Ubuntu Software Center that unifies package management.
» Read more: Ubuntu 9.10 Desktop Edition Released
CentOS-5.4 i386 and x86_64 Released
October 23rd, 2009CentOS community annouced the availability of CentOS-5.4 for i386 and x86_64 Architectures this week. It’s based on the upstream release Redhat Enterprise Linux 5.4.0 and includes packages from all variants including Server and Client.
This is just an announcement email, not the release notes. The Release Notes for CentOS-5.4 can be found on-line at wiki.centos.org. » Read more: CentOS-5.4 i386 and x86_64 Released
Expedition Inside the Linux File Systems
October 21st, 2009Here’s a good document on file system analysis. As mentioned from this document:
The aptly named UNIX Filesystems: Evolution, Design, and Implementation is only giving a general overview of how things work. Practical File System Design with the Be File System by Dominic Giampaolo is an an enjoyable read but, as the name indicates, it only deals with BeFS. » Read more: Expedition Inside the Linux File Systems
Convert RHEL 5 to CentOS 5
October 20th, 2009Recently I was working on a Dell PE1950 at work and decided to get Xen installed, so that I can create some virtual servers for our developers.
Finding out that Xen in Redhat Enterprise Linux is not so easy to download – I cannot find it from any public accessible websites, I decided to use CentOS’s yum repoes to download and install Xen. When I have CentOS yum repo created in /etc/yum.repo.d, I noticed that it cannot work in RHEL – It cannot recognize OS version without some updates of application. » Read more: Convert RHEL 5 to CentOS 5
OpenVZ On CentOS 5.4 installation and configuration
October 14th, 2009This article will describe how to create OpenVZ container in CentOS 5.4. With OpenVZ you can create multiple Virtual Private Servers (VPS) on same hardware machine and running them simultaneously and efficiently.
OpenVZ is the open-source branch of Virtuozzo, a commercial virtualization solution widely used by hosting providers. The OpenVZ kernel patch is licensed under GPL license, and the user-level tools are under the QPL license.
» Read more: OpenVZ On CentOS 5.4 installation and configuration
Perl-5.11.0 released and what’s new
October 5th, 2009Perl 5.11.0 was released yesterday (02/Oct/2009) , as well as a schedule for future 5.11.x releases. As a DEVELOPMENT release, Jesse Vincent encouraged testing of the new version, saying, “If you write software in Perl, it is particularly important that you test your software against development releases. While we strive to maintain source compatibility with prior releases wherever possible, it is always possible that a well-intentioned change can have unexpected consequences. » Read more: Perl-5.11.0 released and what’s new
Life Cycle of Redhat Enterprise Linux
October 2nd, 2009The Red Hat Enterprise Linux Life Cycle is designed to reduce the level of change within each major release over time increasing predictability and decreasing maintenance costs. Every major version of Red Hat Enterprise Linux is maintained and supported independently during the life cycle. » Read more: Life Cycle of Redhat Enterprise Linux