Colocation Facility Cooling System Considerations

Most companies know to find a colocation facility that has good Internet service and Internet provider and carrier options. However, cooling systems are often overlooked. Most servers now are made to operate at normal office conditions, which mean that two environmental factors should be met:

• The temperature should stay between 72° F and 76° F
• The humidity should be between 45% and 60%, with 45% ideal
• Cooling units must be on continuously, so servers will not overheat (this precludes standard HVAC units).

If the cooling system goes down, it can cause the equipment to overheat, causing the network to go down and even damaging equipment. Colocation facility cooling systems include three areas: the facility layout, chillers, and computer room air conditioning (CRAC) units.

Facility Layout
Servers generate heat as they run. This is generally blown out the back of the server by fans; cool air is taken in through vents at the front. Server racks and rows should be laid out to manage hot air coming from the servers and conditioned air going to their intakes by designating "hot rows," which face the server fans, and "cold rows," which face the intakes. Designated hot and cold rows keep air circulating in the best directions to keep servers from overheating.

Facility Design
There are two kinds of building design for colocation facilities: raised floor and solid floor. Raised floor was the preferred structure when servers were towers because the mesh flooring allowed air conditioned air to blow from the bottom directly across their intakes. However, since servers are stacked in racks, cold air must reach the tops of the racks to cool machines. Solid floor facilities are a better option. The facility should take into account the following:

• Solid floor designs must have mesh front and rear doors for th server cabinets to allow hot air to escape.
• For raised floor designs, cold air must have enough air pressure to force air to the top of the server cabinets. Ideally, special duct work will be in place to force the airflow upward.
• For raised floors, server cabinets should not have vents in the doors that would let cool air escape.

Chiller Systems
Chillers pipe water or water/glycol coolants through the CRAC units. Chiller systems include pumps, pipes, and the chillers themselves. The following points should be considered to make sure that the system is adequate to cool the facility:

• Sufficient capacity
• Backup units for the pumps and chillers which switch over automatically
• Regular maintenance

CRAC Units
CRAC units are massive, dedicated air conditioners which manage temperature and humidity. They have many parts and are complicated – meaning failures can be common. The CRAC units should be well maintained, but the most important thing is redundancy. Redundancy is determined by the overall capacity of the CRAC units; there should be enough units that even with a failure, the facility will still be adequately cooled. As with chillers, capacity for CRAC units is determined by tons per square foot.

Verify Capacity
Capacity is determined by the ratio of tons per square foot. To determine whether a system has sufficient capacity, divide the total tonnage of the units by the square footage of the building. If there are four 30-ton CRAC units in a 4,000 square foot facility, then the CRAC capacity is .030 tons per square foot (120 tons / 4,000 square feet). The ideal ratio of tons to square feet for the CRAC system is .030 ton/square foot or higher; the ratio should not be below .025 tons/square foot. This same formula is used for chiller systems, with the same ideal ratios.

It is important to look for a colocation facility that has Internet provider options and backup power systems. Equally important is a facility with the right design, chillers, and CRAC units to cool the server room. Keeping equipment from overheating will keep networks up and makes equipment last longer. Like Internet connections, network uptime, and power backups, cooling systems signify a quality colocation facility.

Working With Major Publishing Houses

Publishing a book is one of the best ways to build credibility and gain exposure. Not only can it position you as an expert in your field but it could also open the door to entirely new opportunities just because you are now an author. Indeed, almost any author will tell you the best thing they ever did was publish their first book.

There are three primary options for getting your book published. The easiest way is to self-publish the book yourself, meaning you complete the work and send it to a printer. Done. The second option is to use an independent publisher. These are legitimate publishers but they're smaller than the big boys and tend to specialize in one area or another. The last option is the most ambitious and it involves the industry majors like Penguin and Random House.

Any aspiring author would prefer to get their book published by a major publishing house. It gives you far more credibility and enhances your chances of selling the book once it's on retail shelves. But getting one of the big publishers to publish your book is no easy task. There are a number of things you need to keep in mind before you even get started.

Most importantly, the big publishing houses only work with proven authors. That means it's extremely difficult to get them to work with you on your first book. They want to know you've successfully sold books before. And if it's your first book, you better have an impressive platform and an audience you can easily tap into to promote sales. Bottom line; they don't really care what your book is about. Their top priority is your ability to sell it.

The big publishers generally don't deal directly with the author anyway. They prefer to deal through Literary Agents. These are basically screeners who receive hundreds of book proposals each month and sift through them looking for those with real potential. Getting a Literary Agent is step one if you hope to get your book published by one of the big publishing houses.

A great way to find Literary Agents is to go to a book store and find books similar to the one you'd like to write. Then look at the acknowledgments. In most cases, the authors will thank their agents in that section and you can simply make note of their names and then look them up on Google. Then contact them and see if they're accepting new proposals.

Book proposals for the big publishing houses are generally quite large. It's not unusual for the proposal to be 100 pages long. In fact, you're almost better off writing the entire book ahead of time and then putting the proposal together afterwards. You'll end up including a sample chapter in the proposal anyway and there are plenty of other things it should include. You can find more information about what needs to be included by doing a Google search for book proposal.

Getting your first book published by one of the industry majors is difficult but it's not impossible. Do your research on the front end and learn how the system works. That will be your greatest asset when starting the process. You can find a lot more tips and tricks for getting books published on my website and I hope you take advantage of the free information available there.