Condusiv Technologies Blog

Condusiv Technologies Blog

Blogging @Condusiv

The Condusiv blog shares insight into the issues surrounding system and application performance—and how I/O optimization software is breaking new ground in solving those issues.

Independent performance testing on fragmentation?

by Helpdesk 9. November 2005 02:47
Once and a while I'm asked for independent studies on the performance effects of disk fragmentation. There are some excellent studies out there. Diskeeper Corporation recently sponsored a paper done by Windows IT Pro. Their writer, Joe Kinsella, actually developed his own test tools in order to do a very thorough fragmentation performance study: http://www.windowsitpro.com/whitepapers/index.cfm?fuseaction=showwp&wpid=4D2B047D-E1F8-4F20-A74DB68E7521E730&code= Besides the recent study we sponsored, there are a bunch of other independent studies in existence. A quick Google search yields a Harvard University study on UNIX: http://www.eecs.harvard.edu/~keith/research/tr94.html I was unable to find a university study on Windows. I imagine Universities are probably less interested in studying the effects of fragmentation on FAT and NTFS, because it's generally considered common knowledge that file fragmentation hurts their performance. Once in a while a media source does in-depth fragmentation testing as part of a review, such as this PC Mag article: http://www.pcmag.com/article2/0,1895,1591466,00.asp The non-profit organization National Software Test Lab (NSTL) has also done performance tests on fragmentation: http://www.softwareshelf.com/HTML/products/prod_materials/5/NSTLXP_mddvdk.pdf - Paul

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Checkout Diskeeper's New Knowledge Center

by Jeff Medina 2. November 2005 02:40
Our new Diskeeper Knowledge Center is one of the most complete sources of research and test data on disk fragmentation: http://www.diskeeper.com/products/documentation/documentation.asp

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Server Virtualization Weakens Hard Drives?

by Helpdesk 27. October 2005 02:43
Server virtualization is expected to be one of the more disruptive technologies on the horizon. For those that don't know, server virtualization refers to running multiple instances of server OS'es on a single hardware platform. For instance a company could use server virtualization software, such as MS Virtual Server 2005 or VMware, to run virtual instances of both their file and database servers on a single hardware platform. Why would you do this? So you can better match your service needs to the available hardware, possibly reducing the number of servers you employ.

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Diskeeper and email servers

by Helpdesk 8. June 2005 02:35
Diskeeper works safely and effectively with email servers, whether they are Microsoft, Exchange, Lotus, Domino, QUALCOMM, Eudora, or others. Diskeeper is uniquely designed to run in the background while these applications are operational and available to users. There is no need to stop or shutdown these applications or services to defragment. There are two types of volume-centric fragmentation with which Diskeeper is immediately concerned: file fragmentation and free space fragmentation. File fragmentation concerns computer files that are not contiguous, but rather are broken into scattered parts. Free space fragmentation describes a condition in which unused space on a disk is scattered into many small parts rather than a small number of larger spaces. File fragmentation causes problems with accessing data stored in computer files, while free space fragmentation causes problems creating new data files or extending (adding to) old ones.

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