VMware vSphere

Advice On Downgrading Adobe Flash

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VMware has a KB article out (linked below) about the Adobe Flash crashes that happen if you’re running the latest version of Flash (27.0.0.170). A lot of us were caught off guard recently when our PCs updated themselves and we couldn’t get into our VMware vSphere environments. The VMware KB article suggests downgrading your Flash client. Left by itself this is completely irresponsible advice. 1. The Adobe Flash update addresses a critical security vulnerability that is being exploited in the wild. The security advisory (linked below) states: Adobe has released a security update for Adobe Flash Player for Windows, Macintosh, Linux and Chrome OS. This update addresses a critical type confusion vulnerability that could lead to code execution. Adobe is …

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For The Best Performance Use a Recent Operating System and a Recent Hypervisor

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This is post #1 in my December 2013 series about Linux Virtual Machine Performance Tuning. For more, please see the tag “Linux VM Performance Tuning.” Just like in construction, performance tuning is most effective when you have a good foundation. If the underpinnings of your efforts are weak you won’t be able to build a skyscraper, just a small office building. While that’s still better than nothing, there is often a lot to be gained by using the newest versions of your OS & hypervisor of choice. Some quick examples: Windows Server 2012 R2 added Virtual Receive-side Scaling, which allows the load from network traffic to be processed by multiple virtual CPUs. VMware vSphere 5.5 added support for latency-sensitive VMs, …

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VMware vSphere 5.5 & Dell 12G Servers: Reliable Memory Technology

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A few days ago Dell released BIOS updates for their 12th generation servers. Among all the notes about preparations for the Intel E5-2600 v2 refresh there’s one line that’s of interest to those of us thinking about running vSphere 5.5 on our version 1 12G hardware: New Memory Operating Mode setup option ‘Dell Fault Resilient Mode’ This is a patented new technology from Dell, wherein the hypervisor and system hardware can work together to place the hypervisor in a more redundant section of memory. Dell servers have shipped with a variety of tricks to protect against memory faults, things like Memory Page Retire, which will dynamically remove a page from usable memory space if it encounters an error. However, to …

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