AFAICS in the YaST partitioner, this is in the "MD Options" dialog: https://github.com/yast/yast-storage-ng/blob/master/src/lib/y2partitioner/dialogs/md_options.rb There is are two combo boxes on this page: - chunk size - parity Both are always there, and always enabled. AFAICS we should now disable the "chunk size" combo box if it's a RAID 1, and set the value to an empty string. And we should change the help text, too: https://github.com/yast/yast-storage-ng/blob/master/src/lib/y2partitioner/dialogs/md_options.rb#L77 "For RAID 1, the chunk size does not affect the array very much." (wrong: it doesn't affect it at all) to "For RAID 1, the chunk size is not applicable."