Uptime objectives » History » Revision 2
Revision 1 (Nico Schottelius, 03/01/2019 03:38 PM) → Revision 2/9 (Nico Schottelius, 03/01/2019 03:38 PM)
h1. Uptime objectives {{toc}} h2. 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 h2. 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% h2. 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% h2. 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% h2. Routers h2. Servers * What: Servers host VMs and in case of a defect VMs need to be restarted on a different server