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Archive for September, 2006

What’s on menu? – Data Cloud Cuisine 2007

The war of the data clouds will really start to heat up in 2007 as large Internet companies such as Google, Yahoo!, and Microsoft open huge data centers in the Pacific Northwest fueled by cheap power and bandwidth. Our digital lives continue to be fueled by the cloud, with new data services and software that replace or complement desktop tasks coming online every month. Software as a service is the new development push, and custom build outs next to a few large dams and fiber highways are a sign of what’s next.

Internet giants are now building up their server farm arsenals in a race to be the center of our digital lives. If you build it, and millions of customers come, where will you put it all? Farms previously covered with apple trees are being converted to modern data centers full of lasers, copper, and more air conditioning than most of the county. The growth of online services is partially limited by the ability to deliver large amounts of data over low-latency connections to a growing user base. The data grids deployed by large multinational Internet companies will continue to grow as our demand for online software and storage is fueled by new services in the cloud.

What would you do with infinite computing resources, storage, and bandwidth? Huge data centers coming online in the next year may provide part of the modern answer.

Microsoft is building a new data center on 74 acres in the town of Quincy in central Washington. The six-building complex will include about 1.5 million square feet covered in rows of server racks to power current and future online services. The site includes a electrical substation and a diesel-powered generator for backup power just in case there is an interruption in the 48 megawatts of power drawn from the local power grid.

Power and fiber is provided by Grant County, one of a few counties near the Columbia River with its own hydroelectric dam and fiber networks. Unlike big cities and existing hubs of activity these counties are special economic zones with tax incentives for research and development spending.

Microsoft’s new data center is over 8 times the size of 365 main, a large data center in San Francisco housing companies such as Technorati. It’s a little less than three football fields full of server racks drawing a power equivalent of about 50,000 homes. Electricity rates from these county-owned power grids are over 8 times cheaper than you might pay to plug-in your computer at home.

Other large build-outs

Microsoft is not the only large Internet Company opening large data centers next year. Yahoo! has a 50-acre site and a smaller office complex and hosting space just up the river at Wenatchee. Yahoo! has contracted about 42 megawatts to power their main facility and about 5 megawatts to power its smaller location in the Confluence technology Center, right on top of a fiber terminus.

Google is building out a 30-acre site in the Dalles, Oregon. The site is located next to a hydroelectric dam providing cheap power for Google’s growing server base. Construction is wrapping up on the first two buildings with about 34,000 square feet of space in each.

Software as a service

All this construction and contract negotiation with municipalities, data providers, and local employee bases provides large Internet companies with advantages startups can only dream of. Once the new data centers come online it is expect to see new services spring up from the big players ready to take advantage of the new space and capacity.

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Swap file

Swap file is a disk file used to temporarily save a program or part of a program running in memory.

Windows swap file

A disk file used by Windows for its virtual memory. A virtual memory system temporarily stores segments of the application on disk when there is not enough memory to hold all the programs called for.

WINDOWS 95/98

Windows 95/98 creates only a temporary swap file (WIN386.SWP) that is dynamically sized and abandoned. It can also reside on a compressed drive as long as it is under the control of the DRVSPACE.VXD Protected Mode driver. To adjust the Windows 95/98 swap file, double click on the System Control Panel and select the Performance tab, then Virtual Memory.

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KDE

KDE is a network transparent contemporary desktop environment for UNIX workstations. KDE seeks to fill the need for an easy to use desktop for Unix workstations, similar to the desktop environments found under the MacOS or Microsoft Windows. With KDE there is now an easy to use contemporary desktop environment available for UNIX. Together with a free implementation of UNIX such as GNU/Linux, UNIX/KDE constitutes a completely free and open computing platform available to anyone free of charge including its source code for anyone to modify.

KDE can be viewed either as a user desktop or as a development platform for applications. This page will quickly describe the major features of both.

K Desktop Environment :

Konqueror Browser: It is KDE’s next-generation web browser, file manager and document viewer & widely heralded as a technological break-through for the GNU/Linux desktop.

KOffice Office Suite: KDE also ships with the highly anticipated release of the KOffice suite. The integrated suite consists of a spreadsheet application (KSpread), a vector drawing application (Karbon), a frame-based word-processing application (KWord), a presentation program (KPresenter), and a chart and diagram application (KChart).

KIO Network Transparency: KIO’s network transparency offers seamless support for accessing or browsing files on GNU/Linux, NFS shares, MS Windows SMB shares, HTTP pages, FTP directories and LDAP directories.

aRts Multimedia Architecture : KDE 2.0 introduced a new multimedia architecture based on aRts, the Analog Realtime Synthesizer. ARts enables playing multiple audio or video streams concurrently, whether on the desktop or over a network.

Customizability: KDE’s customizability touches every aspect of this next-generation desktop. KDE’s sophisticated theme support starts with Qt’s style engine, which permits developers and artists to create their own widget designs.

Standards Compliance: Besides the exceptional compliance with Internet and file-sharing standards mentioned above, KDE achieves exceptional compliance with the available GNU/Linux desktop standards.

Site: http://www.kde.org

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KNOPPIX

KNOPPIX is a bootable CD with a collection of GNU/Linux software, automatic hardware detection, and support for many graphics cards, sound cards, SCSI and USB devices and other peripherals. KNOPPIX can be used as a Linux demo, educational CD, rescue system, or adapted and used as a platform for commercial software product demos. It is not necessary to install anything on a hard disk. Due to on-the-fly decompression, the CD can have up to 2 GB of executable software installed on it.

Software installed on the KNOPPIX-CD:
The following Highlights are available in this Debian-based (www.debian.org) CD:

* Linux-Kernel 2.4.x and 2.6.x
* KDE as the standard desktop with K Office and the Konqueror WWW-browser konqueror
* X Multimedia System (xmms) an MPEG-video, MP3, Ogg Vorbis Audio player and xine
* Internet connection software kppp,pppoeconf (DSL) and isdn-config
* Gnu Image Manipulation Program (GIMP)
* utilities for data recovery and system repairs, even for other operating systems
* network and security analysis tools for network administrators
* OpenOffice(TM), the GPL-developed version of the well-known StarOffice(TM) office suite
* many programming languages, development tools (including kdevelop) and libraries for developers
* in total more than 900 installed software packages with over 2000 executable user programs, utilities, and games.

Site : http://www.knoppix.net

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SpamAssassin

What is spamassassin ?
———————-
The SpamAssassin system is software for analyzing email messages,
determining how likely they are to be spam, and reporting its conclusions.
It is a rule-based system that compares different parts of email messages
with a large set of rules. A message with a high enough score is reported to
be spam.

How it works ? : -
—————

–> There are several ways that SpamAssassin makes up its mind about a
message:
–> The message headers can be checked for consistency and adherence to
Internet standards (e.g., is the date formatted properly?).
–> The headers and body can be checked for phrases or message elements
commonly found in spam (e.g., “MAKE MONEY FAST” or instructions on how to be
removed from future mailings)-in several languages.
–> The headers and body can be looked up in several online databases that
track message checksums of verified spam messages.
–> The sending system’s IP address can be looked up in several online lists
of sites that have been used by spammers or are otherwise suspicious.
–> Specific addresses, hosts, or domains can be blacklisted or whitelisted.
A whitelist can be automatically constructed based on the sender’s past
history of messages.
–> SpamAssassin can be trained to recognize the types of spam that you
receive by learning from a set of messages that you consider spam and a set
that you consider non-spam. (SpamAssassin and the spam-filtering community
often refer to non-spam messages as ham. )
–> The sending system’s IP address can be compared to the sender’s domain
name using the Sender Policy Framework (SPF) protocol (http://spf.pobox.com)
to determine if that system is permitted to send messages from users at that
domain. This feature requires SpamAssassin 3.0.
–> SpamAssassin can privilege senders who are willing to expend some extra
computational power in the form of Hashcash (http://www.hashcash.org).
Spammers cannot do these computations and still send out huge amounts of
mail rapidly. This feature requires SpamAssassin 3.0.

Most of SpamAssassin’s behavior is controlled through a systemwide
configuration file and a set of per-user configuration files. The per-user
configuration can also be stored in an SQL database.

How to Configure it ? : -
——————-

You can easily customize how SpamAssassin tags and identifies spam by
creating a spamassassin/user_prefs file. You can customize the number of
“spam points” required to identify a message as spam, create new rules, and
re-weight existing rules. Here is a sample user_prefs file. It raises the
threshold for identifying spam from 5 to 6, disables including spam warnings
in the subject and body, reweights a known rule, and adds several blacklist,
whitelist, and header rules.

Listing 1. A typical user_prefs configuration file

================================================================

#How many hits before a mail is considered spam?
required_hits 6

#Don’t mangle the messages so badly
rewrite_subject 0
use_terse_report 1

#whitelist and blacklist
whitelist_from *@www.eukhost.com
blacklist_from annoying-person@xyz.com

#reweight an existing rule
score BASE64_ENC_TEXT 3

#add some new rules
header KNOWN_LIST List-Id =~ /a-mailing-list-i-like/
score KNOWN_LIST -3

body EVITE /This invitation was sent to you by .* using Evite/
describe EVITE Looks like an eVite
score EVITE -3

================================================================

At heart, SpamAssassin is a set of modules written in the Perl programming
language, along with a Perl script that accepts a message on standard input
and checks it using the modules. For higher-performance applications,
SpamAssassin also includes a daemonized version of the spam-checker and a
client program in C that can accept a message on standard input and check it
with the daemon.

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Xfce 4

Xfce is a lightweight desktop environment for unix-like operating systems. It aims to be fast and lightweight, while still being visually appealing and easy to use.

Xfce 4.2 embodies the traditional UNIX philosophy of modularity and re-usability. It consists of a number of components that together provide the full functionality of the desktop environment. They are packaged separately and you can pick and choose from the available packages to create the best personal working environment.

Xfce 4 can be installed on several UNIX platforms. It is known to compile on Linux, NetBSD, FreeBSD, Solaris, Cygwin and MacOS X, on x86, PPC, Sparc, Alpha…

Features:

* Freedesktop specifications compliance for Window Manager hints, menus, icons themes, XDG Basedir Specification, Xsettings protocol, drag and drop…
* Real multiscreen and Xinerama support.
* Support for “kiosk mode” in which the allowed user actions can be restricted in xfce4-session, xfce4-panel, and xfdesktop.
* Development framework for applications.
* Xft fonts anti-aliasing support.
* You can install/launch each Xfce module separately. Very useful if you do not need them all or if you have very limited system resources.
* More than 40 languages translations…
Site: http://www.xfce.org

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