A disconnect seems to be emerging between the technologies vendors believe are important in the cloud, and the way traffic is flowing between cloud data centres. While much is made of a world in which workloads are so virtualised they float around between data centres like quanta teleporting around the world, most of the world's …
Just think about the ratio of bandwidth within a data center vs between data centers, what is it perhaps 1000 to 10,000x greater within a data center? I mean you can easily get 30*Tbps* worth of bandwidth with a single rack
of switches. How many racks does the typical "cloud" data center have? Probably quite a few..
Not to mention the latency between facilities..
This entire article is predicated on an unsupported assertion:
"There's a growing conviction among vendors that users want their virtual machines to be able to span different data centres – the vendors believe there's a high demand for the ability to pick up a VM workload in Sydney and move it to, say, San Francisco."
Which vendors? Not Amazon, that's for sure: they don't even support VM migration within an availability zone, let alone from one data center to another. Every fule kno, Molesworth, that best practices for cloud-based workloads involve treating VMs as mostly-stateless; if you need to move one, you fire up a new VM and shoot the old one in the head. Ask Netflix. And although a few VMware shops try to do cross-DC vMotion, the resulting network hairpins are horrible. Shipping a cold VM is a little better, but nobody does it by choice.
Re: Which vendors???
As every fule kno, the people who want workloads to be distributed actually distribute them from the get go, with apps appearing in both data centers in active-active fashion. There's far higher demand for this setup than the flexibility to move VMs at will.
Paris, who knows all about active loads...
"The Cloud" is just transparent tubes
Where data is really stuck.
Sometimes, it seems like smoke and mirrors trying to re-jumpstart the "next tech boom", and most of the stuff of the past 15 years has seemed like a wet/lubed pulley jumping and skipping more than hauling everyone forward
But, hey, if it creates jobs, andn some of the money trickles down to the poor service workers, then I will not be tooooo harsh....
Beer, because I'd sur love to have a Hite right about now...
Feels like a nothing article
As the other commenters have said, this is no surprise. If you want your systems to be efficient, keep all the data movement where you can control quality, and where you have most bandwidth. Data movement is probably inversely linked to cloud success
a cloud is mostly formed by hot air
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