Uptime objectives¶

• Table of contents
• Uptime objectives
  • Power Supply
  • Internal Network
  • L2 external Network
  • L3 external Network
  • Routers
  • Servers

Power Supply¶

• What: Power supply to all systems
• Setup:
  • Core systems are connected to UPS that last between 7-30 minutes
  • Virtualisation systems are not (yet) fully connected to UPS
• Expected outages

Internal Network¶

• What: The connection between servers, routers and switches.
• Setup: All systems are connected twice internally, usually via fiber
• Expected outages
  • Single switch outage: no outage, maybe short packet loss (LACP link detection might take some seconds)
  • Double switch outage: full outage, manual replacement
• Uptime objectives
  • 2019: >= 99.999%
  • 2020: >= 99.9995%
  • 2021: >= 99.9995%

L2 external Network¶

• What: the network between the different locations
• Setup:
  • Provided by local (electricity) companies.
  • No additional active equipment / same as internal network
• Expected outages
  • 1 in 2018 that could be bridged by Wifi
  • If an outage happens, it's long (digging through the cable)
  • But it happens very rarely
  • Mid term geo redundant lines planned
• Uptime objectives
  • 2019: >= 99.99%
  • 2020: >= 99.995%
  • 2021: >= 99.995%

L3 external Network¶

• What: the external (uplink) networks
• Setup
  • Currently one uplink by EDIG / HIAG
• Expected outages
  • Based on 2018
  • Partially unresponsive / unwilling to cooperate
  • Multiple smaller, one bigger outage
  • 2nd and 3rd line providers are evaluated / phased in
  • Plan 2019 phase in 1 connection per DC + third at the hub
• Uptime objectives
  • 2019: >= 99.9%
  • 2020: >= 99.99%
  • 2021: >= 99.995%

Routers¶

Servers¶

• What: Servers host VMs and in case of a defect VMs need to be restarted on a different server