On Wednesday August 10, gbakos@xxxxxxxxxxxxxxx wrote: > Hi, > > The entire OS I am using is running on software RAID-1. Before killing > the power of the UPS (in case of a power outage), I issue: > > /sbin/mdadm --readonly $RAIDDEV > on all the RAID devices I have. > > This, however, does not seem to be enough, and when i power the system > back on, the RAID arrays are not clean, and a long syncing starts. A > last step is missing; something like marking the arrays that they are > clean. I see this happening for a flash of a second when i tell the PC > to "/sbin/poweroff", i.e. "halt -p". The very last second, before the > ATX power is turned OFF, the kernel does something to the md arrays. > > My questions are: > 1. What exactly is this last step? It is exactly switching the arrays to readonly. > 2. Can I achieve it manually by sth like > echo *** > /proc/*** no (maybe echo ?? > /sys/block/.... one day). > or by using mdadm? no. You can only switch an array to read-only when it is not in use. So you have to unmount it first. That possibly sounds a bit pointless, and it probably is. But it hasn't been a high priority. If you are using 2.6, then the arrays will be automatically marked clean after 20ms of inactivity. If you "kill -9" the "md*_raid1" processes, then it will start marking the array clean the instant of inactivity. 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
