我在启动时遇到问题。它无法挂载 aufs（因此暂停启动，询问我是否要继续...对服务器没有好处）
我以为我已经设置了fstab在组件之后安装 aufs：
# <file system> <mount point> <type> <options> <dump> <pass>
/dev/mapper/pdc_bcaageadf2 / ext4 errors=remount-ro 0 1
/dev/mapper/pdc_bcaageadf1 /boot/efi vfat defaults 0 1
/dev/mapper/pdc_bcaageadf3 none swap sw 0 0
/dev/md0 /mnt/tank ext4 defaults,noatime,nodiratime 0 2
/dev/md1 /mnt/sub ext4 defaults,noatime,nodiratime 0 2
/dev/md2 /mnt/heli ext4 defaults,noatime,nodiratime 0 2
none /mnt/video aufs br:/mnt/ssd/video=rw:/mnt/sub/video=ro:/mnt/tank/video=ro:/mnt/heli/video=ro 0 4
但dmesg另有说明：
[ 24.419593] EXT4-fs (md0): mounted filesystem with ordered data mode. Opts: (null)
[ 23.316121] aufs opt_add:736:mount[743]: lookup failed /mnt/sub/video (-2)
[ 24.898982] EXT4-fs (md1): mounted filesystem with ordered data mode. Opts: (null)
[ 25.291669] EXT4-fs (md2): mounted filesystem with ordered data mode. Opts: (null)
有什么建议么？