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Citrix Virtual App user density on AWS

Login VSI workload testing on AWS EC2 instances

If you are in the End User Compute (EUC) space like me, you are undoubtedly aware of the annual VDI Like A Pro survey. In this survey we continue to see the trend of interest in the public cloud growing, however most of the respondents cited cost and performance as major concerns when considering cloud options. At Login VSI we are seeing more traction with enterprises adopting cloud strategies for their digital workspaces, and I am personally very excited about this.

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Testing L1TF patches: Virtual Desktops on VMware ESX

Last week Intel announced 3 new severe vulnerabilities in their processors allowing unauthorized access to the data in the L1-cache. They have been named L1 Terminal Fault or in short L1TF. By now I assume most IT-admins are aware of this, but the performance impact remains a mystery. That’s why we took it upon us to get you this information as soon as possible. Please note that these are initial findings. As we are doing more research and get more results we will constantly publish new updates.

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Testing Meltdown and Spectre patches: Citrix XenServer 7.2 versus 7.5

Meltdown and Spectre

A few weeks ago we published a blogpost around Meltdown and Spectre on XenServer 7.2. In the previous blogpost I mentioned that the results were surprisingly good and other then expected. This feeling kept bothering me and urged me to verify if the behavior and results were correct. After some research I found out that the patches were applied and that both used tools (Powershell and Inspectre.exe) to check this verified this.  I decided to install newer versions of XenServer to see if the results and behavior was consistent to what we saw with XenServer 7.2. I chose to focus on XenServer 7.5 as this is the latest version that XenServer currently supplies. I also updated it to the latest patch version (XS75E002). 

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Supporting Disaster Recovery with Login VSI

To protect and maintain business continuity is key for any organization. To cope with all (IT related) changes that may impact application availability and therefore disturb business operations, most large organizations have implemented comprehensive and structured change management programs. Programs including pre- and post-testing planned changes with realistic user numbers, and pro-active detection of slowdown caused by unplanned changes or gradual deterioration.

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Testing Meltdown and Spectre patches: RDSH (SBC and XenServer 7.2) using Windows server 2012R2 and Server 2016

Meltdown and Spectre

After all the news around Meltdown and Spectre it seems things are calming down now. Recent talks are focusing more on next-generation exploits rather than the performance impact. The Login VSI Meltdown and Spectre emergency edition has been a great success and helped many of our customers, vendors and community friends. I’d like to share some results from our internal performance validation labs where I’ve conducted tests on a large number of operating systems measuring the impact of patches on the OS, Hypervisor and BIOS level. Please keep in mind that this is a lab environment, results will vary on your own systems.

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Login VSI Analysis of HPE SimpliVity 2600 RA

Congratulations to HPE SimpliVity for another successful reference architecture, validated by Login VSI. This hyperconverged (HCI) reference architecture is based on HPE’s latest 2600 architecture, leveraging the SimpliVity XL170r nodes. In just 4U this RA demonstrates high performance for 700 and 1000 Knowledge Workers. Think about that… you could almost fill a room with that many laptops. Moore’s law is definitely in effect here as SimpliVity demonstrates the Intel Xeon 6152 Skylake server architecture, capable of up to 8 nodes in that 4U footprint.

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Introducing new indices VSIavg100, VSIavg250, VSIavg500, VSIavg1000 and VSIavg5000

With the emergence of Cloud-based and Hyper Converged Infrastructures (HCI), the concept of maximum number of users is slowly getting obsolete. In tests of these auto-scaling infrastructures the VSImax score is often not reached. The index VSIbase remains valid as a description of the baseline performance (one user) of a system, but we need a series of new indicators to be able to better understand, communicate and compare the performance of systems while being used by larger number of users.

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Top 3 Challenges for NHS IT Departments

The National Health Service (NHS) is the name used for the 4 public health services in the United Kingdom (England, Scotland, Wales and Northern Ireland). The NHS provides a comprehensive range of health services, free for people ordinarily resident in the United Kingdom. Together the 4 National Health Services employ around 1.6 million people with a combined budget of £136.7 billion.

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