Posted under General, Programming, c++
This post was written by Chirag on April 15, 2009
Datacenter tiering
Tier 1:
- 99.671% uptime
- annual 28.8 hrs downtime
- full shutdown for preventive maintenance
Tier 2:
- 99.741% uptime
- annual downtime of 22 hrs
- some redundancy with single path for power, requiring shutdown for preventive maintenance
Tier 3:
- 99.982% uptime
- annual 1.6 hrs downtime
- sufficient redundancy to allow planned maintenance
- at least 13.2 KV power
Tier 4:
- 99.995% uptime
- annual downtime of 0.4 hrs
- multiple paths to power and AC and designed to handle worst case scenario with no critical impact
- at least 26.2 KV power
Posted under General, Infrastructure
This post was written by Chirag on September 7, 2008
Network tiering
Tier 4:
- most datacenters
- owns internal network
- pay other networks for IP transit outside the facility
Tier 3:
- regional providers
- build redundancy thru’ redundant POPs (points of presence) outside facility
- pay for IP transit past the POPs
Tier 2:
- national or international footprint
- still pay IP transit to reach some portions of Internet
Tier 1:
- do not pay IP transit
- global presence
- don’t pay other providers for any portion of connectivity
Posted under General, Infrastructure
This post was written by Chirag on September 7, 2008
LAMP
My first post on this blog is rightly selected - lamp! My name is Chirag and its meaning in Indian languages viz. Sanskrut/Gujarati or even in Urdu/Arabic, is lamp.
Nowadays in USA, we have a choice of buying “day light” energy saver lamps at Home Depot or similar stores. These spiral “day light” energy savers are real energy savers. I have saved tens of bucks on electricity every month.
Today, I am talking about a different LAMP which you might be aware of already. Linux + Apache + MySQL + PHP. It’s about free software movement. If you have LAMP, virtually everything used on computers can be created! I am serious.
At the same time, I am an ardent fan of Microsoft movement as well. It’s not about capitalism only or not being greedy. It has more to do with simplicity in action. If you can visualize bell jar curve, you will rightly understand that major area of that curve is occupied by middle portion of the curve. Say, right side 10% is for very naive people like artists. They want very very simple application and that domain is captured by MAC. Then, there is 10% portion of the curve in left side, which is for “intellectuals”. They know what they are doing and nobody else understands that. This domain is ruled by LAMP! The rest 80% portion is captured by Microsoft! This is area comprising common people. They need some power and much simplicity!!!
I will try to explore LAMP and Microsoft Windows in coming posts. Happy reading (or happy getting bored…)
Posted under General
This post was written by Chirag on June 27, 2008
