On Saturday December 10, yang.geum.seok@xxxxxxxxx wrote: > I am sorry because there is no information very. > > I currently ext3 file system. > > I composed RAID-1(/dev/md0) disk array by order such as lower part. > > mkfs.ext3 -j /dev/sda1 > mkfs.ext3 -j /dev/sda1 > mdadm -Cv /dev/md0 --level=1 --raid-devices=2 /dev/sda1 /dev/sdb1 This is not the way raid1 works. The raid1 array /dev/md0 will be slightly smaller than either sda1 or sdb1. So the filesystem will 'think' it is the size of sda1, will eventually discover it is smaller, and will fail. You should: mdadm -Cv /dev/md0 --level=1 --raid-devices=2 /dev/sda1 /dev/sdb1 mkfs.ext3 -j /dev/md0 mount /dev/md0 /data/disk1 and THEN use the filesystem. 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