Hi misc@, I originally mentioned this on my 'e2fsprogs' badblocks can't use /dev/rsd1c device' thread, but heard crickets and thought to narrow the scope some.
Should /dev/sdUp be notably less performant than /dev/rsdUp? /dev/rsdUp will give me 150MB/sec in both directions. /dev/sdUp will give me 20MB/sec writes and 60MB/sec reads. Though on mounted FFS, /dev/sdUp seems performant. Thanks! -Henrich