How to Avoid a Redundant Path to Power Failure - 1
A basic element of any data center is power. In many cases it is taken for granted. However, in reality, power loss or poor power quality is a major contributor to downtime.I am not referring to a major utility power failure, just to a common pitfall of power distribution system practice and management. There are several basic, but key, power components in the data center.
1. Utility power source(s) and main power panel(s)
2. Backup generator and ATS (automatic transfer switch)
3. UPS (uninterruptible power supply) and maintenance bypass panel
4. PDU (power distribution unit) (or subpanel from UPS)
5. Rack-level PDU
6. Server's internal PS (power supply)
In a "perfect" scenario, such as a Tier 4 data center, there are two completely independent power paths, each composed of items 1-6. Each path and the items in the path must be capable of supporting 100 percent of the entire data center load by itself. This represents true 2N redundancy, which means that no single point of failure will interrupt the operation of the data center equipment.