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It annoys me to no end when people don't explain their abbreviations... "AZ" means Availability Zone, which is to say: Data Center. So cross-AZ means going to m

It annoys me to no end when people don't explain their abbreviations... "AZ" means Availability Zone, which is to say: Data Center. So cross-AZ means going to multiple data centers.

sleepy_keita 6y ago
AZ is a well-known abbreviation in AWS. For all intents and purposes, it can mean a data center, but I've heard that AZs can span multiple physical data centers (which sort of makes sense -- there's a physical limit to how many servers you can fit in to one physical data center)
- jen20 6y ago
  Some AZs have five data centers, though I’m not sure that up-to-date numbers are published. A DC and a single AZ are definitely not equatable in this regard.
Dunedan 6y ago
An availability zone isn't equivalent to a data center, as it might consist of multiple data centers. A better explanation for availability zone would be "a bunch of data centers in close physical proximity, exposed to users as a single logical entity". Or as AWS explains it [1]: > An Availability Zone (AZ) is one or more discrete data centers with redundant power, networking, and connectivity in an AWS Region. AZ’s give customers the ability to operate production applications and databases that are more highly available, fault tolerant, and scalable than would be possible from a single data center. [1]: https://aws.amazon.com/about-aws/global-infrastructure/regions_az/ https://aws.amazon.com/about-aws/global-infrastructure/regio...
- joana035 6y ago
  It still data center. And when you choose the low latency instance placement means that all your virtual machines are placed in the same rack and/or host. Basically throwing availability over the window.
  - xxpor 6y ago
    >And when you choose the low latency instance placement means that all your virtual machines are placed in the same rack and/or host That's also not true.
    - joana035 6y ago
      https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/placement-groups.html https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/placemen... check it out :)

It annoys me to no end when people don't explain their abbreviations... "AZ" means Availability Zone, which is to say: Data Center. So cross-AZ means going to multiple data centers.

sleepy_keita 6y ago

AZ is a well-known abbreviation in AWS. For all intents and purposes, it can mean a data center, but I've heard that AZs can span multiple physical data centers (which sort of makes sense -- there's a physical limit to how many servers you can fit in to one physical data center)

jen20 6y ago
Some AZs have five data centers, though I’m not sure that up-to-date numbers are published. A DC and a single AZ are definitely not equatable in this regard.

Dunedan 6y ago

An availability zone isn't equivalent to a data center, as it might consist of multiple data centers. A better explanation for availability zone would be "a bunch of data centers in close physical proximity, exposed to users as a single logical entity". Or as AWS explains it [1]: > An Availability Zone (AZ) is one or more discrete data centers with redundant power, networking, and connectivity in an AWS Region. AZ’s give customers the ability to operate production applications and databases that are more highly available, fault tolerant, and scalable than would be possible from a single data center. [1]: https://aws.amazon.com/about-aws/global-infrastructure/regions_az/ https://aws.amazon.com/about-aws/global-infrastructure/regio...

joana035 6y ago
It still data center. And when you choose the low latency instance placement means that all your virtual machines are placed in the same rack and/or host. Basically throwing availability over the window.
- xxpor 6y ago
  >And when you choose the low latency instance placement means that all your virtual machines are placed in the same rack and/or host That's also not true.
  - joana035 6y ago
    https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/placement-groups.html https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/placemen... check it out :)