[GitHub] [cloudstack] rafaelweingartner edited a comment on pull request #4567: Qemu 2.10 requires `-U` flag to read volume metadata

[GitBox <gi...@apache.org>]

rafaelweingartner edited a comment on pull request #4567:
URL: https://github.com/apache/cloudstack/pull/4567#issuecomment-754625687


   @rhtyd I checked this one with him. The problem happens on Qemu 2.10+ (running on Ubuntu). The release notes from Qemu have the following message.
   ```
   Qemu 2.10 added the requirement of a --force-share flag to qemu-img
   info when reading information about a disk that is in use by a
   guest. We do this a lot in Nova for operations like gathering
   information before live migration.
   
   ```
   
   The problem is happening when ACS tries to get some info from a volume using qemu-img. Then, one would get the following error.
   ```
   qemu-img: Could not open '/mnt/.../../volumeID': Failed to get shared "write" lock
   Is another process using the image?
   
   ```


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