weizhouapache edited a comment on issue #3720: VM stopped/crashing while 
Migration with Maintenance Mode (KVM)
URL: https://github.com/apache/cloudstack/issues/3720#issuecomment-561073274
 
 
   @svenvogel @andrijapanicsb 
   ```
   vm is stopped due to some cloudstack bugs. for example, when we put a
   host to maintenance, the vm will be stopped if (1) no other host is Up in
   same cluster, or (2) vm migration fails and no retry in cloudstack, or (3)
   multiple vms are migrated to same destination at the same time but there is
   no enough memory on the destination.
   ```
   (1) has been tracked in #3707 and discussed by some comments in this ticket.
   (2) is changed in #3425 but not done.
   (3) is fixed by #3727 and #3728. which caused crashed vm in host maintenance 
on our platforms.
   

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