[ncc-services-wg] New on RIPE Labs: RPKI Repositories and the RIPE Database in the Cloud

On 13 May 2021, at 16:19, Niall O'Reilly wrote:

> I will share my arithmetic separately later.

So, as promised.

1.  Time to recover five-nines availability after worst-case 
service-recovery delay:

     An hour’s outage must be matched by a minimum of 99,999 hours 
uninterrupted
     availability.

     99999 / ( 24 * 365 ) gives 11.4. That’s nearly eleven and a half 
years.

2.  Maximum cumulative outage between RIPE meetings which would allow 
RIPE NCC
     to report achieving the five-nines target.

     RIPE meetings are held twice a year, but not precisely six months 
apart;
     the interval is approximately 180 days.

	Converting to seconds and dividing by 100,000 is equivalent to 
multiplying
     by 0.864, as there are 86400 seconds in a day.

	180 * 0.864 gives 155.5 seconds, or just over 2 minutes and 30 seconds.

Best regards,
Niall
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