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. 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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  2. 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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  3. 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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  4. 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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  5. 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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  6. The New XenApp – Reducing IOPS to 1

    As we all know, IOPS are the bane of any application and virtualization project. If you don't have enough, users will suffer. If you have too many, you probably spent too much money and your business will suffer. So we are always trying to find ways to more accurately estimate IOPS requirements as well as finding ways to reduce the overall number. About 5 months ago, ...

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  7. One Imaging Solution to Rule Them All

    As we all know, a single image management solution is extremely important in the VDI world. We will have hundreds or thousands of desktops that must be built and maintained. Image management is even more important when we have stateless desktops because we want our desktop to be reset to its original state after each user session. If you are doing stateless desktops without some ...

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  8. “Low Cost” doesn’t mean junk

    As you might have seen in previous blogs, I've been developing a set of low cost design guides for organizations that want to mobilize windows apps, refresh PCs and enable remote access to enterprise PCs (as well as a few others). Most of the time when people think low cost, they automatically think what you will get is pretty much garbage, but this is far ...

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  9. New – XenApp 7.5 and XenDesktop 7.5 Visio Stencils!

    One of the most common things every design document has is a conceptual diagram showing how the entire solution fits together. XenApp 7.5 and XenDesktop 7.5 is no different. If you looked at the XenApp 7.5 and XenDesktop 7.5 blueprint blog, you would have seen a new conceptual diagram based on the Citrix 5-layer model (Users, Access, Resources, Control and Hardware). The good news is that ...

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  10. XenApp 7.5 and XenDesktop 7.5 Blueprints Now Available

    If you look at the XenApp and XenDesktop deployments to date, you will notice that most of the users' requirements fit into one of the following buckets: User requires access to a line of business application User requires access to a standardized desktop environment User requires access to a personalized desktop environment A combination of the above Another thing you will notice with these 4 buckets is that "Users" "Access" ...

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