Daniel Feller

Daniel Feller is a Lead Architect at Citrix.  With a app and desktop virtualization history dating back to 1997, Daniel has participated in many different deployments taking on many different roles.  After graduating from Purdue University, Daniel started out as an IT Admin deploying WinFrame and MetaFrame 1.0. Daniel soon joined Citrix Consulting as one of the first consultants and spent many years working on some of the world's largest and most complex environments. In addition to field projects, Daniel has also authored several well known whitepapers like the XenDesktop Design Handbook and created the intricate logic behind Citrix Project Accelerator.  Daniel can usually be seen speaking at conferences focusing on design topics for application and desktop virtualization.
  1. Click, Play and See the Citrix Optimization for Microsoft Lync

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    I spent the last few blogs, dissecting Microsoft Outlook and how we can integrate an Exchange Online server, as part of Office 365, with XenApp and XenDesktop. Can I use a Cached Exchange Mode with XenApp and XenDesktop When to use Cached Exchange Mode with XenApp and XenDesktop How to use Cached Exchange Mode with XenApp and XenDesktop (I really need to be a little more creative with these ...

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  2. Office 365 for XenApp


    One of my favorite foods is Chicago deep-dish pizza. Every time I end up in Chicago, I try to hit up one of the great deep dish pizza places (Lou Malnati's, Gino's East, Giordano's, etc). Unfortunately, I can't get to Chicago as often as I want a thick slice of pizza.  So, I've tried to make my own. Most of my attempts were edible.  But, after ...

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  3. You don’t have to be a rocket scientist to see value of RAM Cache

    Windows-Not the Operating System Kind!

    A few years ago, we replaced all of our windows in our home (I'm talking about the panes of glass you look through, not the operating system). In the process, of course we talked with a few different companies who stopped by.  We went through their product portfolio and brought along samples. One demonstration stuck with me. The sales person, placed his sample window flat ...

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  4. ESG Lab Spotlight Report: Up to 80% Reduction in Storage Cost for VDI and RDS

    You've heard the news, you've seen the videos, and now the storage savings have been verified! According to an ESG report, the new RAM Cache with Disk Overflow feature, included in the XenApp and XenDesktop 7.6 release, has the potential to reduce storage costs by 80% or more. Now before you stop reading thinking this is too good to be true, think about the storage ...

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  5. Click, Play & See How New XenDesktop & XenApp Storage Optimizations Improve the User Experience

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      There's no better way to learn than to see the new technology Sure.  I've written and seen numerous blogs/tweets about how great the new storage optimization feature is for XenApp and XenDesktop. I've read how this feature can reduce IOPS from an average of 15 IOPS per Windows 7 user down to 0.1 IOPS. I've read how this feature functions by creating a small RAM buffer within ...

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  6. Should I upgrade from XenApp 7.5 to XenApp 7.6?

    After delivering the XenApp 7.6 Upgrade webinar I received a few questions asking if it is a good idea to upgrade from XenApp 7.5 to XenApp 7.6. My first reaction is, "Of course you should. Why wouldn't you?"   But I'm a little biased J You need to ask yourself if the new features within XenApp 7.6 are important enough to upgrade. Look at the following subset of features and ...

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  7. XenApp 7.6 Upgrade – You got questions, I got answers

    Recently, I gave a webinar (recorded for your viewing pleasure) on upgrading to XenApp 7.6, and while this webinar is just one of many efforts Citrix is doing to help everyone make the upgrade to XenApp 7.6, there was a big turnout.  Citrix has a website (www.citrix.com/xenapp/upgrade) dedicated to helping all of you, who are looking at upgrading your existing XenApp to 7.6, with links ...

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  8. Diving deeper into the latest XenDesktop 7.5 IOPS results

    As you saw in a previous blog, XenDesktop 7.5 is able to achieve an average IOPS value of less than 1/10th per user. Of course when you put out unbelievable results like this you hear a lot of comments trying to find holes in the results or test procedures. This is as it should be as it is part of any good scientific method. In order ...

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  9. Less than 1 IOPS per user with XenDesktop 7.5

    It is amazing when you've been focused on a technology for so long that you start to see major improvements. In 2010, I provided my original guidance on XenDesktop IOPS. Four years later, have we seen any major improvement? See for yourself. As you might be aware, I've been working with the Citrix Solutions Lab on validating standardized designs. These validated designs are published as Citrix ...

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  10. The Changing Read/Write Ratio for XenApp

    As technology changes, so too does a recommendation. For years when you deployed XenApp servers with Provisioning Services, the storage Read:Write ratio would be 10:90. This is still the case in most scenarios. But in analyzing the latest data from the Citrix Solutions Lab, who were testing the "RAM Cache with Overflow to Disk" option, we encountered some results that will make us revisit some of ...

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