Placing a Gluster master storage domain into maintenance mode fails

Issue

• I fail to deactivate the master storage domain and move it to another storage domain.

• When i put the current master storage domain into maintenance it fails and reconstructs the same storage domain.

• Trying to put the master storage domain into maintenance mode fails.

• The vdsm logs on the SPM host contain;

jsonrpc.Executor/0::ERROR::2016-07-21 05:35:39,989::sp::864::Storage.StoragePool::(masterMigrate) migration to new master failed
Traceback (most recent call last):
  File "/usr/share/vdsm/storage/sp.py", line 853, in masterMigrate
    exclude=('./lost+found',))
  File "/usr/share/vdsm/storage/fileUtils.py", line 68, in tarCopy
    raise TarCopyFailed(tsrc.returncode, tdst.returncode, out, err)
TarCopyFailed: (1, 0, '', '')

• Further debugging revealed that the tar` command was reporting file changed as we read it for files associated with active tasks on the SPM host.