-`scsi[n]`: `[file=]<volume> [,aio=<native|threads>] [,backup=<on|off>] [,bps=<bps>] [,bps_rd=<bps>] [,bps_wr=<bps>] [,cache=<none|writethrough|writeback|unsafe|directsync>] [,cyls=<count>] [,detect_zeroes=<1|0>] [,discard=<ignore|on>] [,format=<drive format>] [,heads=<count>] [,iops=<iops>] [,iops_max=<iops>] [,iops_rd=<iops>] [,iops_rd_max=<iops>] [,iops_wr=<iops>] [,iops_wr_max=<iops>] [,iothread=<off|on>] [,mbps=<mbps>] [,mbps_max=<mbps>] [,mbps_rd=<mbps>] [,mbps_rd_max=<mbps>] [,mbps_wr=<mbps>] [,mbps_wr_max=<mbps>] [,media=<cdrom|disk>] [,queues=<nbqueues>] [,secs=<count>] [,serial=<serial>] [,snapshot=<on|off>] [,trans=<none|lba|auto>] [,werror=<enospc|ignore|report|stop>]` ::
+`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>` ;;
+
+Maximum read speed in megabytes per second.
+
+`mbps_rd_max`=`<mbps>` ;;
+
+Maximum unthrottled read pool in megabytes per second.
+
+`mbps_wr`=`<mbps>` ;;
+
+Maximum write speed in megabytes per second.
+
+`mbps_wr_max`=`<mbps>` ;;
+
+Maximum unthrottled write pool in megabytes per second.
+
+`media`=`<cdrom | disk>` ('default =' `disk`);;
+
+The drive's media type.
+
+`rerror`=`<ignore | report | stop>` ;;
+
+Read error action.
+
+`secs`=`<integer>` ;;
+
+Force the drive's physical geometry to have a specific sector count.
+
+`serial`=`<serial>` ;;
+
+The drive's reported serial number, url-encoded, up to 20 bytes long.
+
+`size`=`<DiskSize>` ;;
+
+Disk size. This is purely informational and has no effect.
+
+`snapshot`=`<boolean>` ;;
+
+Whether the drive should be included when making snapshots.
+
+`trans`=`<auto | lba | none>` ;;
+
+Force disk geometry bios translation mode.
+
+`werror`=`<enospc | ignore | report | stop>` ;;
+
+Write error action.
+
+`scsi[n]`: `[file=]<volume> [,aio=<native|threads>] [,backup=<1|0>] [,bps=<bps>] [,bps_max_length=<seconds>] [,bps_rd=<bps>] [,bps_rd_length=<seconds>] [,bps_wr=<bps>] [,bps_wr_length=<seconds>] [,cache=<enum>] [,cyls=<integer>] [,detect_zeroes=<1|0>] [,discard=<ignore|on>] [,format=<enum>] [,heads=<integer>] [,iops=<iops>] [,iops_max=<iops>] [,iops_max_length=<seconds>] [,iops_rd=<iops>] [,iops_rd_length=<seconds>] [,iops_rd_max=<iops>] [,iops_wr=<iops>] [,iops_wr_length=<seconds>] [,iops_wr_max=<iops>] [,iothread=<1|0>] [,mbps=<mbps>] [,mbps_max=<mbps>] [,mbps_rd=<mbps>] [,mbps_rd_max=<mbps>] [,mbps_wr=<mbps>] [,mbps_wr_max=<mbps>] [,media=<cdrom|disk>] [,queues=<integer>] [,secs=<integer>] [,serial=<serial>] [,size=<DiskSize>] [,snapshot=<1|0>] [,trans=<none|lba|auto>] [,werror=<enum>]` ::