On Monday November 15, lieven.vanacker@xxxxxxxx wrote: > Hey folks, > > I didn't find any direct pointers on this issue, so maybe you experts > can advice me... > > I was setting up a system, had only one disk at setup time but wanted to > configure raid 1 in advance... > > so I used > > mdadm --create /dev/md0 --force --run --level=1 --raid-devices=1 > /dev/sda1 > > to create my array. > > Now as I have the second disk available, after duplicating the partition > table I wanted to add add /dev/sdb1 to the array. > > But > > mdadm /dev/md0 -a /dev/sdb1 > > adds this device as a spare one, so the number of active devices stays > 1. I could use the build command to reinitialise the array, but I wonder > if there's a way to extend the raiddevice while it's running? If you are running a recent 2.6 kernel and have a recent mdadm, then mdadm --grow /dev/md0 --raid-devices 2 will convert /dev/md0 to a 2 device raid1 array, and the spare will start being reconstructed. 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
