Is there an architecture spec or overview document for dm-log.c ? If not, what is it's function? What arguments are used in its setup? If I'm setting up a raid1 I would do something like raid1.mirror > 0 `blockdev --getsize` mirror core 1 1024 2 /dev/hde 0 /dev/hdg 0 --- The last line is parsed by dm-raid1.c. The 1024 is sent to dm-log, but why? What function does it do? What are the first two arguments; 0 max-block-count used for? core is the type of dm-log, but what is a 'core' dm-log? --- Do you have examples of setting up a raid1? --- Thanks, Cal Page