Feeds

Amazon gets 'F' for communication amidst cloud outage

CTO's distributed computing pal analyzes EC2 failure

  • alert
  • submit to reddit

Top three mobile application threats

'500,000' volumes affected

According to RightScale's extrapolations, about 500,000 EBS volumes were affected.

"After Amazon managed to contain the problems to one zone, it took a very long time to get the EBS machinery under control and to recover all the volumes. Given the extrapolated number of volumes it would not be surprising that an event of this scale exceeded the design parameters and was never tested (or able to be tested). I’m not sure there is any system of comparable scale in operation anywhere," von Eicken says.

"I do want to state that while 'something large' clearly failed, namely the EBS system as a whole, the real big failure is that multiple availability zones were affected for ~3 hours."

In addition, von Eicken says he's "uncomfortable" with the performance of Amazon RDS (Relational Database Service), which serves up MySQL and at least one other database via EC2. RDS also experienced problems during the outage. "Some databases that were replicated across multiple availability zones did not fail-over properly," he says. "It evidently took more than 12 hours to recover a number of the multi-[availability zone] databases."

According to von Eicken, Amazon has "made it difficult" to backup their database outside of RDS, and this leaves them "no choice but to wait for someone at Amazon to work on their database. This lock-in is one reason many of our customers prefer to use our MySQL master-slave setup or to architect their own."

Even RightScale, he says, was confused by Amazon's terse status messages. "In hindsight we should have intentionally failed-over our master database which was operating in the 'impacted availability zone' early on at a time where we could minimize downtime." he says. "We were lucky that it didn’t get affected until about 12 hours after the start of the outage, but we didn’t connect one and one. A clear message from Amazon that more and more volumes were continuing to fail in the zone would have been really helpful."

von Eicken has called on Amazon to make a long list of improvements to its communication policies. These include giving actual percentages of volumes affected by an outage, listing the names of each availability zone affected, and sending individual status updates to particular users.

"Use email (or other means) to tell us what the status of our instances and volumes is," he says. "I don’t mean things I can get myself like cpu load or such, but information like 'the following volumes (by id) are currently recovering and should be available within the next hour, the following volumes will require manual intervention at a later time, …' That allows users to plan and choose where to put their efforts."

But he also wants a blog post from the company. Which is still yet to be seen. As of 1pm Pacific time on Monday, Amazon says that a "vast majority" of volumes have been recovered and that EBS is now operating normally for all APIs on these volumes, but some volumes have not been recovered, and the company says it is working to contact the customers involved.

Thorsten von Eicken was a professor in Cornell's computer science department when Werner Vogels did research there, and the two have coauthored distributed-computing research. RightScale began as a web front-end for Amazon Web Services when the service was only accessible from a command line, but it has sense morphed into a management service for several other infrastructure clouds as well. ®

High performance access to file storage

More from The Register

next story
This time it's 'Personal': new Office 365 sub covers just two devices
Redmond also brings Office into Google's back yard
Kingston DataTraveler MicroDuo: Turn your phone into a 72GB beast
USB-usiness in the front, micro-USB party in the back
Dropbox defends fantastically badly timed Condoleezza Rice appointment
'Nothing is going to change with Dr. Rice's appointment,' file sharer promises
Inside the Hekaton: SQL Server 2014's database engine deconstructed
Nadella's database sqares the circle of cheap memory vs speed
BOFH: Oh DO tell us what you think. *CLICK*
$%%&amp Oh dear, we've been cut *CLICK* Well hello *CLICK* You're breaking up...
Just what could be inside Dropbox's new 'Home For Life'?
Biz apps, messaging, photos, email, more storage – sorry, did you think there would be cake?
Amazon reveals its Google-killing 'R3' server instances
A mega-memory instance that never forgets
Cisco reps flog Whiptail's Invicta arrays against EMC and Pure
Storage reseller report reveals who's selling what
prev story

Whitepapers

Top three mobile application threats
Learn about three of the top mobile application security threats facing businesses today and recommendations on how to mitigate the risk.
Combat fraud and increase customer satisfaction
Based on their experience using HP ArcSight Enterprise Security Manager for IT security operations, Finansbank moved to HP ArcSight ESM for fraud management.
The benefits of software based PBX
Why you should break free from your proprietary PBX and how to leverage your existing server hardware.
Five 3D headsets to be won!
We were so impressed by the Durovis Dive headset we’ve asked the company to give some away to Reg readers.
SANS - Survey on application security programs
In this whitepaper learn about the state of application security programs and practices of 488 surveyed respondents, and discover how mature and effective these programs are.