Transmission

XMission's Company Journal

Building a Stratum 1 NTP Server with a Raspberry Pi

Introduction I wanted to build my own NTP stratum 1 time server. An NTP server is a server that connects to the Internet to serve time to clients who can use that time to adjust the clock on their computer. NTP uses stratum levels to determine the distance from the source clock. A stratum 0 […]

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Zimbra calendar problem? Try this easy fix for shared CalDAV calendars.

In today’s Zimbra Power Tip we show how to fix a very specific calendaring issue where some calendar applications cannot write to, view, or create events on a shared CalDAV calendar. This is specific to CalDAV configured Android devices, iPhones and iPads, or even iCal on your Mac. What is happening? Let’s identify a scenario around this […]

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OpenWest 2014 is almost here (and sold out)! May 8-10 in Orem

Over 1,000 open source enthusiasts gather in Orem this week for the 7th annual OpenWest Conference. The fun begins on Thursday, May 8 at 9 a.m. at the UVU Science Building. The conference extends through Saturday, May 10. This event has sold out. XMission has sponsored the conference for many years (this year, we’re Platinum!). […]

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Data Center Sustainability Improvements Via Free Cooling

  Water Side Economizing Also known as “free cooling,” water side economizing provides significant energy efficiencies because it doesn’t rely on traditional refrigeration. For this final post in my series about energy saving data center cooling strategies I’ll focus on the significant role water side economizing plays in modern data center HVAC (Heating Venting Air […]

The Salt of XMission

As system administrators at XMission, we hold to the Three Great Virtues of programmers, immortalized by Larry Wall, the inventor of Perl, but adapted for admins: Laziness- The quality that makes you go to great effort to reduce overall energy expenditure. It makes you write labor-saving scripts and configs that other admins will find useful, […]

Why Your Data Center Should Have Aisle Containment

As I say in my previous blog post, data centers in the United States use a full 1% of the nation’s power so improving efficiencies makes very real sense. In this series of blog posts about HVAC (Heating Venting Air Conditioning) cooling strategies for computers I summarize the main elements you should focus on to make […]

Data Center Cooling Optimizations Bring Big Wins

At XMission we have just completed some significant energy efficiency improvements in our data center. To educate the public and our customers as well as promote sustainable energy practices, I will be writing some blog posts about industry trends and the steps we have taken at XMission to dramatically improve our energy efficiencies. These best […]

Utah Public Health Association Recognizes XMission

Today, XMission received a “Working for a Healthier Utah” award from the Utah Public Health Association (UPHA) in recognition of our ongoing corporate support of their organization. According to their website (hosted by XMission!), UPHA “is a non-profit organization of public health professionals working together for a healthier Utah through advocacy, education, and collaboration with […]

Google Fiber in Salt Lake City?

Yesterday, Vince Horiuchi from the Salt Lake Tribune called me for comment on a story that was under embargo until 11am today. Google Fiber is investigating Salt Lake City. In Kansas City and Provo, incredible concessions were made to install Google as a residential fiber monopoly. Kansas City waived franchise fees, and gave free office […]

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Preventing Participation in Distributed Denial of Service

Over the past week, XMission has seen a sharp spike in Distributed Denial of Service (DDoS) attacks. These attacks utilize spoofing of requests over UDP services to servers that would otherwise believe they are coming from a trusted source. Essentially these unwitting servers act as amplifiers, taking in a few bytes of a command and […]

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