5 ms·
> Technologists describe their systems as having “uptime” and measure it in “nines”, such as “We have five nines of uptime”, which means that a system has 99.99
by usmannk 3y ago
> Technologists describe their systems as having “uptime” and measure it in “nines”, such as “We have five nines of uptime”, which means that a system has 99.999% uptime or, equivalently, about five minutes of downtime per year. Five nines is admirable in many circumstances and would be considered _disastrously_ below expectations for e.g. Google Search.
This seems wrong? 5 9s is probably a reasonable benchmark or even unattained goal for Google Search, right?
- bombcar 3y agoFive nines is about six minutes of downtime a year. Google search fails for me perhaps about that. Now to get five nines for Google a bunch of parts below it have to be more redundant and reliable.
- resolutebat 3y agoMy favorite set of Google 9s is that Google Cloud Storage offers 11 9s (99.999999999%) of durability. The availability SLO is 99.95% though. https://cloud.google.com/storage/docs/availability-durability https://cloud.google.com/storage/docs/availability-durabilit... https://cloud.google.com/storage/sla https://cloud.google.com/storage/sla
- ZephyrBlu 3y agoYou do realize that durability and availability are different properties of a system, right?
- pinkmuffinere 3y agoIsn’t that explicitly what they’re pointing out?
- bombcar 3y agoHmm that durability means that after some period of time, all your data is gone. Could be once a year lol