Understanding Boot Time Warnings When Mirroring the root (/) File System

After you mirror your root (/) file system, error messages will be displayed in the console and logged in the system log that is defined in the /etc/syslog.conf file. These error messages do not indicate a problem. These messages are displayed for each device type that you are not currently using, because an unused module cannot be force loaded. The error messages are similar to the following:

Jul 13 10:17:42 ifr genunix: [ID 370176 kern.warning] WARNING: forceload of 
    misc/md_trans failed
Jul 13 10:17:42 ifr genunix: [ID 370176 kern.warning] WARNING: forceload of 
    misc/md_raid failed
Jul 13 10:17:42 ifr genunix: [ID 370176 kern.warning] WARNING: forceload of 
    misc/md_hotspares failed

You can safely disregard these error messages.