Data Center Management Gotchas

As the complexity of IT infrastructure continues to increase in data centers, managers must look ahead to avoid unexpected downtime. A list of 10 common surprises for data center/IT managers was released by PTS supplier, Emerson Network Power, at AFCOM Data Center World Spring 2012.

According to a Ponemon Institute study, an outage can cost an organization
an average of about $5,000 per minute. That’s $300,000 in just an hour.

The 10 common surprises include:

1. Those high-density predictions finally are coming true
2. Data center managers will replace servers three times before they replace UPS or cooling systems
3. Downtime is expensive
4. Water and the data center do not mix – but we keep trying
5. New servers use more power than old servers
6. Monitoring is a mess
7. The IT guy is in charge of the building’s HVAC system
8. That patchwork data center needs to be a quilt
9. Data center on demand is a reality
10. IT loads vary – a lot

For complete details on the Emerson list, click here.
As a Diamond Solutions Partner for Emerson, PTS Data Center Solutions leverages our engineering and architectural experience in designing and building data centers with our IT network, storage, virtualization expertise to avoid the surprises mentioned in the article before they result in significant downtime. To learn more contact PTS today.

Data Center Cooling: Approaches to Avoid

Data center cooling problems can compromise availability and increase costs. The ideal data center cooling system requires an adaptable, highly-available, maintainable, manageable, and cost effective design.

When working to design an effective data center cooling system, there are a number of commonly deployed data center cooling techniques that should not be implemented. They are:

• Reducing the CRAC supply air temperature to compensate for hot spots
• Using cabinet and/or enclosures with either roof-mounted fans and/or under-cabinet floor cut-outs, without internal baffles
  
• Isolating high-density RLUs

Reducing CRAC Temperatures

Simply making the air colder will not solve a data center cooling problem. The root of the problem is either a lack of cold air volume to the equipment inlet or it is lack of sufficient hot return air removal from the outlet of the equipment. All things equal, any piece of equipment with internal fans will cool it self. Typically, equipment manufactures do not even specify an inlet temperature. They usually provide only a percentage of clear space the front and rear of the equipment must be maintained to ensure adequate convection.

Roof-mounted cabinet fans

CFD analysis conclusively proves that roof-mounted fans and under-cabinet air cut-outs will not sufficiently cool a cabinet unless air baffles are utilized to isolate the cold air and hot air sections. Without baffles, roof-mounted fan will draw not only the desired hot air in the rear, but also a volume of cold air from the front prior to being drawn in by the IT load. This serves only to cool the volume of hot air which we have previously established as a bad strategy. Similarly, providing a cut-out in the access floor directly beneath the cabinet will provide cold air to the inlet of the IT loads, however, it will also leak air into the hot aisle. Again, this only serves to cool the hot air.

Isolating high-density equipment

While isolating high-density equipment isn’t always a bad idea, special considerations must be made. Isolating the hot air is in fact, a good idea. However, the problem is in achieving a sufficient volume of cold air from the raised floor. Even then, assuming enough perforated floor tiles are dedicated to provide a sufficient air volume, too much of the hot air re-circulates from the back of the equipment to the front air inlet and combines with the cold air.

For more information on data center cooling, please download my newest White Paper, Data Center Cooling Best Practices, at http://www.ptsdcs.com/white_papers.asp. You can also view additional publications such as the following at our Vendor White Papers page:

• Avoidable Mistakes that Compromise Cooling Performance in Data Centers and Network Rooms
  
• Essential Cooling System Requirements for Next Generation Data Centers
  
• Explanation of Cooling and Air Conditioning Terminology for IT Professionals
  
• The Different Types of Air Conditioning Equipment for IT Environments
  
• Calculating Total Cooling Requirements for Data Centers
  
• Cooling Audit for Identifying Potential Cooling Problems in Data Centers