> # ll /dev/infiniband > crw-r--r-- 1 root root 231, 255 Jun 23 05:31 ucm > crw-rw-rw- 1 root root 231, 128 Jun 23 05:31 uverbs0 > crw-rw-rw- 1 root root 231, 129 Jun 23 05:31 uverbs1 If you're using a static /dev directory, you'll need to remake the /dev/infiniband/uverbsN character nodes starting at minor 192. - R.