System administration
Aug 1, 2010 12:00 PM, By Brad Gilmer
If you’re a broadcast engineer turned system administrator for media networks, training is key.
If you’re an accidental system administrator, it’s important to receive training on the operating systems your organization supports. Another key area for education is networking fundamentals.
One of the challenges facing system administrators in the post and broadcast space is that they almost always start out doing other things. In my case, I was the engineer who had a knack for computer-related projects; I became a system administrator by accident.
If you are lucky, your organization will realize that it has grown to the point that it needs someone to devote time each day to system administration tasks. Even if you are not given specific time for system administration tasks, it may help to recognize that simple networking projects here and there have grown to the point that you are now a system administrator.
Get on the learning track
You may have gotten some training on equipment when it was delivered, but I would guess that you have not received any education in system administration. Therefore, training is imperative. First, it's important to get training on the operating systems (OS) you support. The training should be specific to system administration if possible. You should also get training on networking fundamentals. Many community colleges offer excellent network training courses. There are also many online courses, and Cisco operates a certification program too.
Second, read everything you can get your hands on. There are good books on system administration, usually written with a particular operating system in mind. This is because every operating system has specific administrative commands and maintenance tasks that differ from OS to OS. Because computer books are frequently expensive, I suggest you check Internet auction sites or my favorite bookstore for used technical books — Powell's Books in Portland, OR, (www.powells.com).
As you grow into your system administration role, become familiar with some of the characteristics that make media networking so challenging. Here are a few things to note:
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Large file sizes
Media files are much larger than typical office application files. I may be stating the obvious, but in a file transfer, the bit rate on the network can be so high for so long that network devices start behaving strangely. Testing was done that showed under some conditions a manufacturer's switch was guaranteed to start dropping packets, even though the network was not fully loaded. Certain common office technologies such as FTP will not handle large media files well, especially over long distances or unreliable networks. This is not because the technologies are broken, but because the designers never assumed that the technology would have to handle such large files.
As a network administrator, it is important to think about how large file sizes will impact typical network topologies and applications. In most cases, people have come up with solutions. For example, there are file transfer acceleration programs available that address the problems associated with moving large files on IP networks.
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Professional streaming media
Many office networks now sustain a large amount of streaming video traffic. But in the professional media environment, the stream sizes are significantly larger. A failure to properly account for the bandwidth required to support this functionality may result in a total failure of the network. In professional media facilities, you may have to construct physically separate networks or virtual local area networks (VLANs) to support the streaming transfer of high bit-rate media.
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Sensitive to bit error
Typical office applications are unaffected by a single bit error. However, media applications can be sensitive to bit error when transferring large media files. In nonoptimized configurations, a two-hour movie transfer might have to be started over if even one bit error occurs on the network. This could be serious if there is not time to restart the transfer. Additionally, a single bit error occurring on a B-frame of an MPEG-compressed stream may cause a disruption that lasts more than one second. There are ways to avoid these problems, but proper network engineering and the use of appropriate applications are required. You may be called upon in your role as network administrator to address bit error issues. Be aware that regular office applications may be unaffected by the occasional bit error, but that professional applications may be severely disrupted.
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Sensitive to network outages
Media companies operate 24/7. Network outages can have serious consequences. Just because a facility has moved to a largely IT-based infrastructure does not mean that the organization is any more accepting of outages. Take this into account as your organization relies more on IT-based infrastructure for its core media functions.
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Sensitive to security breaches
Network security is a sensitive topic for media companies. A network administrator working in this environment should be aware that the company and its mission-critical applications may be a target for hackers. Administrators need to pay careful attention to security issues, as a security breach could have grave consequences.
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Combination of mission-critical and office traffic
Media facilities always contain a combination of mission-critical traffic and typical office environment traffic. Proper network design ensures that issues on the office network do not affect mission-critical functions. I have seen cases where a single failed network interface card (NIC) took down an entire network segment. If the network had not been segmented, the failure would have brought down the station automation system.
Share what you learn
As you become familiar with administering media networks, share what you learn with others. For some reason, many people in a network administration role are adverse to sharing information. But there are many good reasons to spread the knowledge. When you teach someone else, the knowledge is cemented in your own mind. Also, there may be areas where you need to expand knowledge.
In the process of sharing knowledge, you will educate another person in the organization who can help with administrative tasks. Contrary to what you might think, you will not be working yourself out of a job. In fact, it is likely that your organization will acquire more IT-related media technology as time goes on. By getting someone else up on the learning curve, he will be able to help with the additional work.
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