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Uptime objectives » History » Revision 2

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Nico Schottelius, 03/01/2019 03:38 PM


Uptime objectives

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

Updated by Nico Schottelius about 5 years ago · 2 revisions