Fault domain and update domain

Question

Fault domain and update domain

Gabriela Herrera 0

What does underlying Infrastructure Upgrade (UD) and underlying Hardware Failure (FD) mean? I would like to explain it with an example.

KarishmaTiwari-MSFT 20,772 Reputation points Microsoft Employee Moderator

2023-04-26T23:48:22.1766667+00:00

@Gabriela Herrera
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KarishmaTiwari-MSFT 20,772 Reputation points Microsoft Employee Moderator

2023-04-28T23:33:38.92+00:00

@Gabriela Herrera
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KarishmaTiwari-MSFT 20,772 Reputation points Microsoft Employee Moderator

2023-04-26T23:48:22.1766667+00:00

@Gabriela Herrera
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KarishmaTiwari-MSFT 20,772 Reputation points Microsoft Employee Moderator

2023-04-28T23:33:38.92+00:00

@Gabriela Herrera
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Answer 1

TP 124.7K Volunteer Moderator

Hi,

Example of where Update Domain (UD) is applicable: An update needs to be applied to the host operating system.

Example of where Fault Domain (FD) is applicable: Host hardware fails (e.g. power supply, memory, overheat, etc.).

In regards to Update Domains, in my opinion they may eventually be deprecated. They are already deprecated for VM Scale Sets in Flexible mode due to the fact most platform updates are performed using Live Migration.

If the above is useful please click Accept Answer.

Thanks.

-TP

Answer 2

Sam Cogan 10,812 Microsoft Employee Volunteer Moderator

Fault and Upgrade domains are a concept of Azure Availability Sets and are documented here. Upgrade domains are groupings of machines that will have updates applied at the same time. You want to spread machines across updated domains to avoid them being updated at the same time. Fault Domains are groupings of machines that share similar hardware, power, network etc. If you spread machines over fault domains, they will be on different sets of hardware.

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Fault domain and update domain

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