nanog mailing list archives
Re: Amazon diagnosis
From: Jay Ashworth <jra () baylink com>
Date: Fri, 6 May 2011 10:42:13 -0400 (EDT)
----- Original Message -----
From: "Ryan Malayter" <malayter () gmail com>
On May 5, 3:51 pm, Jay Ashworth <j... () baylink com> wrote:----- Original Message -----From: "Ryan Malayter" <malay... () gmail com> I like to bag on my developers for not knowing anything about the infrastructure, but sometimes you just can't do it right because of physics. Or you can't do it right without writing your own OS, networking stacks, file systems, etc., which means it is essentially "impossible" in the real world."Physics"? Isn't that an entirely inadequate substitute for "desire"?Not really. For some applications, it is physics:
You misinterpreted me. I was making fun of people who think "I want it, and therefore it WILL be so" trumps physics, of whom there are altogether too many in positions of power these days to suit me.
I don't have inside knowledge, but I suspect this is why Wall Street firms have DR sites across the river in New Jersey, rather than somewhere "safer".
You don't need inside knowledge; that issue's the subject of much general press lately; that's exactly why they do it. And they think it's good enough. I truly wish that their finding out it's not wouldn't be so massively disrupting for the rest of us poor slobs...
Amazon's EBS service is network-based block storage, with semantics similar to the financial account scenario: data writes to the volume must happen in-order at all replicas. Which is why EBS volumes cannot have a replica a great distance away from the primary. So any application which used the EBS abstraction for keeping consistent state were screwed during this Amazon outage. The fact that Amazon's availability zones were not, in fact, very isolated from each other for this particular failure scenario compounded the problem.
Oh, so maybe "letting someone else do the cloud for you"'s a bad idea? Whod'a thunk *that*? :-) Cheers, -- jra
Current thread:
- Re: Amazon diagnosis, (continued)
- Re: Amazon diagnosis Valdis . Kletnieks (May 02)
- Re: Amazon diagnosis Jeroen van Aart (May 02)
- Re: Amazon diagnosis George Herbert (May 02)
- Re: Amazon diagnosis Jason Baugher (May 03)
- Re: Amazon diagnosis Phil Pierotti (May 03)
- Re: Amazon diagnosis Paul Graydon (May 02)
- Re: Amazon diagnosis Ryan Malayter (May 05)
- Re: Amazon diagnosis George Herbert (May 05)
- Re: Amazon diagnosis Jay Ashworth (May 05)
- Re: Amazon diagnosis Ryan Malayter (May 06)
- Re: Amazon diagnosis Jay Ashworth (May 06)
- RE: Amazon diagnosis Kenneth M. Chipps Ph.D. (May 06)
- Re: Amazon diagnosis Brett Frankenberger (May 01)
- RE: Amazon diagnosis Robert Bonomi (May 01)