> > when a (centos6) raid rebuilds, is that logged somewhere? where? > > > ...has been rebooting a lot lately (see last listing below). Also there > > was the raid rebuild this morning around 9:30 to 11:30... It is not about CentOS. You mean "Linux (software) RAID" here. It would be in /var/log/messages and /var/log/syslog. In messages you will see that it started rebuilding. You can trigger a rebuild yourself. Suppose you have a RAID with 2 devices: /dev/sdc6 /dev/sdc7 under /dev/md0. mdadm /dev/md0 --fail /dev/sdc6 mdadm /dev/md0 --remove /dev/sdc6 mdadm /dev/md0 --add /dev/sdc6 This will remove the first partition and then add it back. IT will rebuild that partition, depending on what mirroring RAID it is. RAID0 will just fail the filesystem. Now look in /proc/mdstat for info and progress: cat /proc/mdstat If you look in /var/log/messages you will see the logs of the events. I would open a terminal and monitor the file before doing the above. Do this: tail -f /var/log/messages This will do.