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[Stephen Finucane <1907179@xxxxxxxxxxxxxxxxxx>]

I assume you're referring to instances with ephemeral or local storage?
If so, this is expected behaviour. Resize revert deletes the instance on
the destination host and resumes the old instance on the source host.
You can work around this by using boot from volume or RBD.

** Changed in: nova
       Status: New => Opinion

** Changed in: nova
       Status: Opinion => Invalid

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https://bugs.launchpad.net/bugs/1907179

Title:
  resize revert will let new data lost!

Status in OpenStack Compute (nova):
  Invalid

Bug description:
  
  * description: 
        Hi all，I found a serious problem in revert resize action for a vm. the revert resize operation will let the increments data lost. the reproduction steps show below.

  
  * Step-by-step reproduction steps: 
  1、 create a new vm， which flavor choice C1-R2-D10（Core：1， Ram： 2G， Disk：10）， image：centos 76

  2、login the vm, and touch a new file: 1.txt, and write some message to
  the file. like: echo 'aaa' > 1.txt

  3、do resize operation for the vm. change flavor to C2-R4-D20. but do
  not confirm or revert the operation now.

  4、login the vm again, and touch another new file: 2.txt, and write
  some message to the file. like: echo 'bbb' > 2.txt

  5、now we do revert-resize operation, revert the resize operation which
  in 2 step.

  6、when the revert resize done, login in the vm, and we will found the
  2.txt will lost.

  
  * Expected output: 

      I think the increment 2.txt added between do resize and revert
  should be preserved.

  
  * Actual output: 

       but the 2.txt lost ！！

  * Version:
    ** OpenStack version： Rocky
    ** Linux distro, kernel. CentOS Linux release 7.8.2003 (Core)、3.10.0-1127.el7.x86_64

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