Hi, this patch makes sure the user at least gets an error message when no device mapper module was loaded (or the version doesn't match): --- tmp/multipath-tools-0.4.0/multipath/main.c 2004-12-10 15:15:03.000000000 +0100 +++ multipath-tools-0.4.0/multipath/main.c 2004-12-16 17:31:04.000000000 +0100 @@ -1048,7 +1048,7 @@ extern int optind; if (dm_prereq(DM_TARGET, 1, 0, 3)) { - dbg("device mapper prerequisites not met"); + fprintf(stderr, "device mapper prerequisites not met.\n"); exit(1); } I'm still hunting a case where multipath exits with zero exit status, without doing anything, but this is a different issue which I'm not able to reproduce at the moment. Patch is against 0.4.0. Cheers, -- Guido