100% uptime - is that possible?

Wouldn't cloud hosting guarantee 100% uptime, if connected to multiple network providers?
 
You'll never achieve 100% system or network uptime. It's just not possible.

I've managed cloud clusters in the past and even with everything in place, nothing will eliminate a network failure.
 
That's why I mentioned again and again, 100% in how long.
In one month, sure we can do.
In one year, sure, we did not have any network outage last year, and we have dozen of servers running more than 1 year without rebooting.
In 3 years? Not yet, as we still needed to reboot server for kernel updates before using Ksplice.

For cloud servers, not mentioning to network, in theory yes, you can reach 100% uptime. However, there are still chances for raid array failed, system cache crashing, etc, that can lead to downtime, even for a small part in a cloud pool. Again, 100% in how long?
 
**** happens, there is no 100% uptime.

99.9 % is the way to go

you need to mantain the server do random checks but in order to do that you will have to take the server offline. so you call that 100%? i consider that as a downtime myself
 
95% is an awful uptime percentage. I'd be long gone at that stage.

Check out this article for percentages - http://en.wikipedia.org/wiki/High_availability

Availability % Downtime per year Downtime per month* Downtime per week
99% ("two nines") 3.65 days 7.20 hours 1.68 hours
99.5% 1.83 days 3.60 hours 50.4 minutes
99.8% 17.52 hours 86.23 minutes 20.16 minutes
99.9% ("three nines") 8.76 hours 43.2 minutes 10.1 minutes
99.95% 4.38 hours 21.56 minutes 5.04 minutes
99.99% ("four nines") 52.56 minutes 4.32 minutes 1.01 minutes
99.999% ("five nines") 5.26 minutes 25.9 seconds 6.05 seconds
99.9999% ("six nines") 31.5 seconds 2.59 seconds 0.605 seconds

For the most part, 99% is what many smaller hosts strive for. Larger hosts are definitely trying to achieve the "4 9's", and many places actually do a pretty good job at that. The ideal is a 5 9's scenario, but it's rare. I don't know anyone who offers a 6 9's guarantee.

All that said, can you achieve 100% uptime? you can get dang close if you have enough failover machines, load balancing and a distributed DNS setup on a world wide platform. 100% at ANYTHING is a near impossible feat for any task. Given enough time and unknown factors, you can remove 100% from your vocabulary. Even death - it's 100% sure you'll be dead at some point in time, but given enough time, science may be able to keep portions of someone alive in the future... so who knows! :)
 
Yea, I am gonna go with everyone else on this. There is no way that anyone can achieve 100% uptime on a web host. Its like saying my wife is 100% not cheating on me. The chances are, she probably isn't, but there is always that 1% chance that she ran of with the barista. There are always unforeseen issues when dealing with web hosts. 99.9999% is possible, but still not likely. Good luck
 
There is nobody no matter how large that really can give 100% up time.
VPS.net had a issue a month ago where their London data center was down.
 
If you’re a small hosting company and your server stayed on 365 days without interruption and you had one client you have achieved 100% uptime.
 
It is possible. If you have multiple Internet service providers to eliminate a possible network error. If you have your main servers which do not have to have anything special just normal servers but redundancy is helpful. If you also keep backup servers which copy all the data from the main server. This is very expensive and more or less will triple costs for an extra 0.01% uptime. This is only used by big companies as having reliable backup servers can cost more than your main servers.
 
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