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Re:Show HN: RonDB – fast key-value database in the cloud by 0xbadcafebee on Sunday May 09, 2021 @11:20PM (#27102364)
Six nines is completely doable if you have the money. Availability is more limited by cost than technical difficulty.

Also consider that availability just means "the service is still running". It may be practically unusable but still available. Always read the fine print.

(Actually their math is wrong: six nines is 31.5 seconds of downtime)

Re:Show HN: RonDB – fast key-value database in the cloud by mikaelronstrom on Monday May 10, 2021 @04:58AM (#27104019)
Yep, 30 seconds is easier to remember as is 5 minutes for 5 9s :)