$ mdadm --version mdadm - v3.1.2 - 10th March 2010
$ls -l /var/run/md* -rw------- 1 root root 108 2010-04-23 20:51 /var/run/mdadm.map
/var/run/mdadm: -rw-r--r-- 1 root root 5 2010-04-23 20:51 monitor.pid
$ mdadm --version
mdadm - v3.1.2 - 10th March 2010
$ls -l /var/run/md*
-rw------- 1 root root 108 2010-04-23 20:51 /var/run/mdadm.map
/var/run/mdadm:
-rw-r--r-- 1 root root 5 2010-04-23 20:51 monitor.pid