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  Post #1 (permalink)   02-16-2012, 07:16 AM
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I wonder if it's possible to provide 100% uptime, I mean server uptime?
 
 
 


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  Post #2 (permalink)   02-16-2012, 08:21 AM
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I would go with a realistic # which is 95%.
 
 
 


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  Post #3 (permalink)   02-16-2012, 10:42 AM
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When saying 100% uptime, you will need to consider the time. 100% in one month, or one year? Less or more?
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  Post #4 (permalink)   02-16-2012, 11:57 AM
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Wouldn't cloud hosting guarantee 100% uptime, if connected to multiple network providers?
 
 
 


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  Post #5 (permalink)   02-16-2012, 01:57 PM
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Quote:
Originally Posted by Artashes View Post
Wouldn't cloud hosting guarantee 100% uptime, if connected to multiple network providers?
Amazon teaches us that it is not so. No matter how much redundancy you have, there will be some failure sooner or later.
 
 
 


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  Post #6 (permalink)   02-16-2012, 03:09 PM
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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.
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  Post #7 (permalink)   02-16-2012, 07:48 PM
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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?
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  Post #8 (permalink)   02-16-2012, 09:01 PM
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lol 100% uptime? depends on the time range i guess.
 
 
 


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  Post #9 (permalink)   02-17-2012, 12:04 AM
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Not only time, but there are somethings that are out of your control. Better to go with 98-99%..
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  Post #10 (permalink)   02-17-2012, 12:06 AM
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**** 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
 
 
 


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  Post #11 (permalink)   02-17-2012, 05:19 AM
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Quote:
Originally Posted by ceekeigh View Post
I would go with a realistic # which is 95%.
You know 95% uptime allows for downtime of over 18 days a year?

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  Post #12 (permalink)   02-17-2012, 09:45 AM
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Murphy's Law says it isn't possible
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  Post #13 (permalink)   02-17-2012, 10:36 AM
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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!
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  Post #14 (permalink)   02-17-2012, 04:34 PM
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Quote:
95% is an awful uptime percentage. I'd be long gone at that stage.
And as bad as that is, I have seen some providers advertising that as a good thing.
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  Post #15 (permalink)   02-18-2012, 12:08 PM
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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
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