local_diskstats(volname=None)Collect Diskstats info of local bricks
:param volname: Volume Name :returns: List of diskstats information { "volume": VOLUME_NAME, "brick_index": BRICK_INDEX_IN_VOL_INFO, "node_id": NODE_ID, "brick": BRICK_NAME, "fs": BRICK_FILESYSTEM, "device": BRICK_DEVICE, "major_number": MAJOR_NUMBER, "minor_number": MINOR_NUMBER, "reads_completed": READS_COMPLETED, "reads_merged": READS_MERGED, "sectors_read": SECTORS_READ, "time_spent_reading": TIME_SPENT_READING, "writes_completed": WRITES_COMPLETED, "writes_merged": WRITES_MERGED, "sectors_written": SECTORS_WRITTEN, "time_spent_writing": TIME_SPENT_WRITING, "ios_currently_in_progress": IOS_CURRENTLY_IN_PROGRESS, "time_spent_doing_ios": TIME_SPENT_DOING_IOS, "weighted_time_spent_doing_ios": WEIGHTED_TIME_SPENT_DOING_IOS }