Why RHV host is non operational with error "OSError: [Errno 117] Structure needs cleaning"

Issue

• The host is non-operational in RHV and is showing error below in the vdsm log.

jsonrpc.Executor/2::ERROR::2018-07-02 11:50:15,382::dispatcher::80::Storage.Dispatcher::(wrapper) [Errno 117] Structure needs cleaning: '/rhev/data-center/mnt/blockSD/aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaa/dom_md'
Traceback (most recent call last):
  File "/usr/share/vdsm/storage/dispatcher.py", line 72, in wrapper
    result = ctask.prepare(func, *args, **kwargs)
  File "/usr/share/vdsm/storage/task.py", line 106, in wrapper
    return m(self, *a, **kw)
  File "/usr/share/vdsm/storage/task.py", line 1181, in prepare
    raise self.error
OSError: [Errno 117] Structure needs cleaning: '/rhev/data-center/mnt/blockSD/aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaa/dom_md'
jsonrpc.Executor/2::INFO::2018-07-02 11:50:15,382::__init__::513::jsonrpc.JsonRpcServer::(_serveRequest) RPC call StoragePool.connect failed (error 302) in 2.60 seconds