On Wednesday June 28, niccolo@xxxxxxxxxxx wrote: > Hello, > > I'm facing this problem: > > when my Linux box detects a POWER FAIL event from the UPS, it > starts a normal shutdown. Just before the normal kernel poweroff, > it sends to the UPS a signal on the serial line which says > "cut-off the power to the server and switch-off the UPS". > > This is required to reboot the server as soon as the power is > restored. > > The problem is that the root partition is on top of a RAID-1 > filesystem which is still mounted when the program that kills the > power is run, so the system goes down with a non clean RAID > volume. > > What can be the proper action to do before killing the power to > ensure that RAID will remain clean? It seems that remounting > the partition read-only is not sufficient. Are you running a 2.4 kernel or a 2.6 kernel? With 2.4, you cannot do what you want to do. With 2.6, killall -9 md0_raid1 should do the trick (assuming root is on /dev/md0. If it is elsewhere, choose a different process name). After you "kill -9" the raid thread, the array will be marked clean immediately all writes complete, and marked dirty again before allowing another write. NeilBrown - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
