az disk update doesn't increase os disk filesystem size

Description

Outline the issue here: According to https://docs.microsoft.com/pdfstore/en-us/Azure.azure-documents/live/virtual-machines/linux.pdf it’s possible to expand os disk. Documentation also shows expanding data disk automatically increase filesystem size. However it doesn’t clarify if it’s possible to automatically increase filesystem size for os disk after its expansion. I expanded os disk using az vm deallocate … az disk update … az vm start … but filesystem size for os disk was not increased automatically after os disk expansion My questions:

• is it by design? if not it has to be fixed. if so it has to be clearly documented. in the latter case what is the way to increase os disk filesystem size after os disk expansion either automatically or manually?

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Environment summary

Install Method: How did you install the CLI? (e.g. pip, interactive script, apt-get, Docker, MSI, nightly)
Answer here: According to https://docs.microsoft.com/en-us/cli/azure/install-azure-cli#windows CLI Version: What version of the CLI and modules are installed? (Use az --version)
Answer here: 2.0.6 OS Version: What OS and version are you using?
Answer here: Windows 10 Pro 64-bit Shell Type: What shell are you using? (e.g. bash, cmd.exe, Bash on Windows)
Answer here: cmd.exe and Bash on Windows

[tjprescott]

Yes, but we should report this somewhere so the docs can be fixed.

[alexeyshishkin01]

ok, I’ve opened an issue https://github.com/MicrosoftDocs/azure-docs/issues/18436