device-mapper (dm): working with multipath-tools. Part 1 Filed under: SCSI, Linux — admin @ 10:33 Device-mapper (hereafter, dm) is one of the best collection of device drivers that I have ever worked with. It brings high availability, flexibility and more to the Linux 2.6 kernel. Device-mapper is a Linux 2.6 kernel infrastructure that provides a generic way to create virtual layers of a block device while supporting stripping, mirroring, snapshots, concatenation, multipathing, etc. While many modules are built on top of device-mapper, the focus of this article is on multipath-tools. Note that I will be using the terms multipath, multipath-tools and dm-multipath interchangeably to signify the same package. Also note that dm-multipath is the name of the repackaged multipath-tools redistributed under Red Hat in their Advanced Server Linux distribution.
One of the main advantages of using Negative type film is the ability to capture a wider dynamic range than can be achieved with Reversal types (slide/chromes). Unfortunately the image data is usually compressed into a much smaller density range. The big trade-off is our inability to immediately see the information due to the orange mask.
Create an iso image from the contents of a directory: mkisofs -hide-joliet-trans-tbl -l -J -f -T -r . > "../directory_dump_`basename $PWD`.iso" When run in a directory (say tmp) it will create a file called directory_dump_tmp.iso one directory higher, which will contain the contents of the tmp directory in it's root.
Friday, March 13, 2009 Extra Repositories for Ubuntu 8.10 You Might Want Ubuntu logoImage via Wikipedia The repository system is a great strength of open-source operating systems, but some people want the latest-and-greatest of a particular application while keeping the core system unchanged. There is also the situation where non-free applications aren't available from within the standard repositories. In these two cases, adding outside repos can help you get the functionality you want. I've done some homework for you and here are the "Extra Repositories for Ubuntu 8.10 You Might Want." Simply open up System > Administration > Software Sources and add the repository lines listed below as a third-party repository.
FOR MORE THAN HALF A CENTURY the eminent physicist Freeman Dyson has quietly resided in Princeton, N.J., on the wooded former farmland that is home to his employer, the Institute for Advanced Study, this country’s most rarefied community of scholars. Lately, however, since coming “out of the closet as far as global warming is concerned,” as Dyson sometimes puts it, there has been noise all around him. Chat rooms, Web threads, editors’ letter boxes and Dyson’s own e-mail queue resonate with a thermal current of invective in which Dyson has discovered himself variously described as “a pompous twit,” “a blowhard,” “a cesspool of misinformation,” “an old coot riding into the sunset” and, perhaps inevitably, “a mad scientist.”
The Thinsy Alfresco 3 for Active Directory is a Virtual Appliance that takes the monstrous complexity out of installing and configuring an Alfresco system. It enables you to bring up Alfresco for Active Directory in a matter of minutes! Download a virtual appliance, and fire up the VM. Full GUI Configuration is included in the virtual appliance. You will not need to log into the underlying linux system to perform any administration tasks.
Feb. 25 (Bloomberg) -- It was 2004 and Tim Geithner, president of the Federal Reserve Bank of New York, had a message for the Federal Open Market Committee in Washington. He told his 18 colleagues gathered around the long mahogany table that a clearinghouse was needed to monitor risks in the burgeoning $5 trillion market for credit-default swaps -- the over-the-counter derivatives that would later spin out of control and help take down Wall Street.
EUCALYPTUS - Elastic Utility Computing Architecture for Linking Your Programs To Useful Systems - is an open-source software infrastructure for implementing "cloud computing" on clusters. The current interface to EUCALYPTUS is compatible with Amazon's EC2 interface, but the infrastructure is designed to support multiple client-side interfaces. EUCALYPTUS is implemented using commonly available Linux tools and basic Web-service technologies making it easy to install and maintain.
I have written many administration guides which cover all of the VMware Enterprise Products (ESX, vCenter, P2V). They have been created in a PDF format.
#2: Replacing same text in multiple files * Difficulty: Intermediate * Application: find/Perl If you have text you want to replace in multiple locations, there are several ways to do this. To replace the text Windows with Linux in all files in current directory called test[something] you can run this: perl -i -pe 's/Windows/Linux/
R Commander is a GUI for the R programming language, licensed under the GNU General Public License. Among the existing R GUIs, Rcmdr together with its plug-ins is perhaps the more viable R-alternative to commercial statistical packages like SPSS. The package is highly useful to R novices, since for each analysis run it displays the underlying R code.
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