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Re: [ Cloud Computing ] Get a life and build redundancy/resiliency in your apps


Pietrasanta, Mark Apr 22, 2011 6:34 AM
Posted in group: Cloud Computing
Right – my point was more about the consolidation of people into a smaller number of very large clouds.  I'm still not aware of what the specific EC2 problem was, but if it was in amazon's core cloud management infrastructure, then this same thing was less likely to happen with such a broad impact in a more traditional environment.  If it was a facility issue like power, or cooling, then perhaps it's a wash.

I'm a huge proponent of cloud, and it's what we're moving all our customers to.

But this outage highlights the issues with the massive public clouds – one core outage and you have thousands of customers out of commission.  In a more traditional hosting model, outages tended to be more isolated because much of the infrastructure was replicated for each customer.  Private clouds are sort of in the middle, with some core infrastructure but also some replicated infrastructure – and the costs are also in the middle.

And you're right that if you want to stay up, you need a DR/COOP plan.  The cloud is not DR/COOP (although it can make it easier/cheaper).  And this is a big wake up call for folks thinking they can just avoid paying for DR/COOP – those costs need to be factored into the move to the cloud, whether it's cross-cloud, or just multi-site within the same cloud.

From: Robert Jenkins <rob...@cloudsigma.com>
Reply-To: "cloud-c...@googlegroups.com" <cloud-c...@googlegroups.com>
Date: Fri, 22 Apr 2011 05:45:55 -0700
To: "cloud-c...@googlegroups.com" <cloud-c...@googlegroups.com>
Subject: Re: [ Cloud Computing ] Get a life and build redundancy/resiliency in your apps

@Mark

I am afraid outages have nothing to do with the cloud and everything to do with the reliability of data centres, carriers etc. which are no more reliable whether used in conjunction with a cloud or your own dedicated infrastructure. There is no evidence that the cloud is any more prone to outages than dedicated solutions. A dedicated solution is no more reliable than a cloud if you only have one location (i.e. single point of failure).

The fact is, it is significantly easier with a cloud deployment to manage multiple locations than if you are dealing with physical hardware yourself. That doesn't of course mean that people using the cloud don't take one single location set-up and port it to the cloud. Often they do and that is why they now see down time with one location going down. Is that really a cloud problem or a single location problem? I think it clearly is the latter.

Kind regards,

Robert

On Fri, Apr 22, 2011 at 2:41 PM, Pietrasanta, Mark <Mark.Pie...@aquilent.com> wrote:
The issue is that one outage effected to many people.  It's a pretty strong argument against moving to the cloud – you've got a lot of eggs in one basket across many companies.

And, if you have to build in full hot DR across vendors, a lot of the cost benefits start to trickle away.

Agree this is a wake up call for people using clouds, but it's also a wake up call for people considering clouds.

From: Robert Jenkins <rob...@cloudsigma.com>
Reply-To: "cloud-c...@googlegroups.com" <cloud-c...@googlegroups.com>
Date: Thu, 21 Apr 2011 22:36:24 -0700
To: "cloud-c...@googlegroups.com" <cloud-c...@googlegroups.com>
Subject: Re: [ Cloud Computing ] Get a life and build redundancy/resiliency in your apps

Agree with these comments. It isn't shocking that AWS has had a significant outage but the number of quite large web operations seemingly relying on one cloud vendor and one location no less. If it wasn't obvious before it is obvious now, don't built your web platform on one vendor and one location. A multi-vendor multi-location strategy needs to be employed in order to provide independence and the sort of reliability people are looking for.

It is worth noting that if any of these companies were managing their own clouds they would likely suffer such outages themselves from time to time and no-one would be that surprised.

Best wishes,

Robert

CTO
CloudSigma
http://www.cloudsigma.com

On Fri, Apr 22, 2011 at 6:12 AM, Tim Crawford <tim.cr...@me.com> wrote:
Agreed. I blogged about this very issue today.
http://wp.me/p515c-6Z

Tim
@tcrawford

On Apr 21, 2011, at 6:42 PM, Ali, Saqib wrote:

Poor amazon has gotten a lot of bad press today. But as if that's not enough, the so-called "analysts" are targeting the whole cloud computing paradigm. While the hybrid cloud vendors are touting their offerings, the nay sayers are rejoicing. 

I think these so-called experts need to go back to school and re-take the application design principles 101. Any recent computer science student knows the importance of building resiliency and redundancy in an app. A good design accounts for the the datastore being unavailable by including replicated datastores in the design. You would do the same even if the application was hosted in your datacenter, why treat amazon any different? Datacenters go down, whether they are internal or in the cloud. It's the reality. Build your applications accordingly.

saqib
@weaselese


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E: rob...@cloudsigma.com
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Create a cloud server in 2 minutes: http://bit.ly/g3UuTN

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