The 2.4 version of Device-Mapper scans for device-numbers in decimal instead of hex (in dm_get_device()). Update 2.6 so both versions use the same behavior. --- linux-2.6.0-test2/drivers/md/dm-table.c 28 Jul 2003 15:40:57 -0000 +++ linux-2.6.0-test2-dm/drivers/md/dm-table.c 29 Jul 2003 15:27:51 -0000 @@ -418,12 +418,12 @@ int r; dev_t dev; struct dm_dev *dd; - int major, minor; + unsigned int major, minor; if (!t) BUG(); - if (sscanf(path, "%x:%x", &major, &minor) == 2) { + if (sscanf(path, "%u:%u", &major, &minor) == 2) { /* Extract the major/minor numbers */ dev = MKDEV(major, minor); } else {