Cannot edit disk while RHEV VM is up

Solution In Progress - Updated -

Issue

  • While trying to extend a disk in RHEV whith "extend size by" we get this error;
Operation Canceled
Error while executing action: 

Cannot edit Virtual Machine Disk. At least one of the VMs is not down.
  • The engine.log file contains;
2015-02-04 12:37:06,259 WARN  [org.ovirt.engine.core.bll.UpdateVmDiskCommand] (ajp-/127.0.0.1:8702-14) [cd3e91a] CanDoAction of action UpdateVmDisk failed. Reasons:VAR__ACTION__UPDATE,VAR__TYPE__VM_DISK,ACTION_TYPE_FAILED_VM_IS_NOT_DOWN
  • Trying to edit the disk size or name while the VM is up and running fails.

  • One VM has two disks. One disk can be edited while the VM is up, but the other can't.

Environment

  • Red Hat Enterprise Virtualization (RHEV) 3.4, 3.5

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