log.debug("getDiskFreeSpace", ex);
            switch ( ex.getNtStatus() ) {
            case NtStatus.NT_STATUS_INVALID_INFO_CLASS:
            case NtStatus.NT_STATUS_UNSUCCESSFUL: // NetApp Filer
                if ( !th.isSMB2() ) {
                    // SMB_FS_FULL_SIZE_INFORMATION not supported by the server.
                    ai = queryFSInformation(th, AllocInfo.class, FileSystemInformation.SMB_INFO_ALLOCATION);