-`aio`=`(native | threads)` ;;
-
-AIO type to use.
-
-`backup`=`boolean` ;;
-
-Whether the drive should be included when making backups.
-
-`bps`=`<bps>` ;;
-
-Maximum r/w speed in bytes per second.
-
-`bps_max_length`=`<seconds>` ;;
-
-Maximum length of I/O bursts in seconds.
-
-`bps_rd`=`<bps>` ;;
-
-Maximum read speed in bytes per second.
-
-`bps_rd_length`=`<seconds>` ;;
-
-Maximum length of read I/O bursts in seconds.
-
-`bps_wr`=`<bps>` ;;
-
-Maximum write speed in bytes per second.
-
-`bps_wr_length`=`<seconds>` ;;
-
-Maximum length of write I/O bursts in seconds.
-
-`cache`=`(directsync | none | unsafe | writeback | writethrough)` ;;
-
-The drive's cache mode
-
-`cyls`=`integer` ;;
-
-Force the drive's physical geometry to have a specific cylinder count.
-
-`detect_zeroes`=`boolean` ;;
-
-Controls whether to detect and try to optimize writes of zeroes.
-
-`discard`=`(ignore | on)` ;;
-
-Controls whether to pass discard/trim requests to the underlying storage.
-
-`file`=`<volume>` ;;
-
-The drive's backing volume.
-
-`format`=`(cloop | cow | qcow | qcow2 | qed | raw | vmdk)` ;;
-
-The drive's backing file's data format.
-
-`heads`=`integer` ;;
-
-Force the drive's physical geometry to have a specific head count.
-
-`iops`=`<iops>` ;;
-
-Maximum r/w I/O in operations per second.
-
-`iops_max`=`<iops>` ;;
-
-Maximum unthrottled r/w I/O pool in operations per second.
-
-`iops_max_length`=`<seconds>` ;;
-
-Maximum length of I/O bursts in seconds.
-
-`iops_rd`=`<iops>` ;;
-
-Maximum read I/O in operations per second.
-
-`iops_rd_length`=`<seconds>` ;;
-
-Maximum length of read I/O bursts in seconds.
-
-`iops_rd_max`=`<iops>` ;;
-
-Maximum unthrottled read I/O pool in operations per second.
-
-`iops_wr`=`<iops>` ;;
-
-Maximum write I/O in operations per second.
-
-`iops_wr_length`=`<seconds>` ;;
-
-Maximum length of write I/O bursts in seconds.
-
-`iops_wr_max`=`<iops>` ;;
-
-Maximum unthrottled write I/O pool in operations per second.
-
-`mbps`=`<mbps>` ;;
-
-Maximum r/w speed in megabytes per second.
-
-`mbps_max`=`<mbps>` ;;
-
-Maximum unthrottled r/w pool in megabytes per second.
-
-`mbps_rd`=`<mbps>` ;;