[GitHub] [cloudstack] andrijapanicsb opened a new issue #4024: qemu 2.10+: consider adding --force-share flag

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

andrijapanicsb opened a new issue #4024: qemu 2.10+: consider adding --force-share flag
URL: https://github.com/apache/cloudstack/issues/4024
 
 
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   ##### ISSUE TYPE
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    * Bug Report
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   Investigate a possible usage of "--force-share" parameter when accessing qcow2 files, due to "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."
   
   Not sure if this is applicable to qemu itself or just qemu-img (nothing to do here...) - but the way to reproduce the issue where this would help is:
   qemu 2.10+, NFS v3 (v4 is not affected)
   kill (power off) the host hosting a running VM
   qemu-img info can not access the qcow2 file and also the VM can't be started - so VM HA actions are affected (this is in contrast to when you kill the qemu process only - then the lock is immidately releases, so this is not a valid test)
   
   Adding the --force-share option might help in VM HA cases, where NFSv3 is used, so that the VM can be started on another host.

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