Know thy data center Tier
A day does not go by when we can't learn something new. Love the "What I learned today" posts that Mike Laverick has been doing.
So here is what I learnt today, the right order for DC tiers.
Some details to show the differences1.
Tier 1 - Basic data center with no redundancy
- No redundancy
- Susceptible to disruptions from both planned and unplanned activity
- May or may not have raised floor, UPS or generator
- Shut down likely to perform preventive maintenance
- Annual downtime of 28.8 hours
- Single distribution path with redundant components
- Less susceptible to disruption from both planned and unplanned activity
- Single path for power and cooling disruption, includes redundant components (N+1)
- Includes raised floor, UPS and generator
- Annual downtime of 22 hours
- Enable planned activity without disrupting computer hardware operation, but unplanned events will still cause disruption
- Multiple power and cooling distribution paths but with only one path active, includes redundant components (N+1)
- Includes raised floor and sufficient capacity and distribution to carry load on one path while performing maintenance on the other
- Annual downtime of 1.6 hours
- Planned activity does not disrupt critical load and data center can sustain at least one worst-case unplanned event with no critical load impact
- Multiple active power and cooling distribution paths, includes redundant components (2(N+1)), such as 2 UPS each with N+1 redundancy
- Annual downtime of 0.4 hours