После перезагрузки вылетает раздел из raid-а

root@ubuntu:~# cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md0 : active raid1 sdb[0] sdc[1]
      16777152 blocks [2/2] [UU]
unused devices: <none>

root@ubuntu:~# mdadm /dev/md0 -a /dev/sde1
mdadm: metadata format 00.90 unknown, ignored.
mdadm: re-added /dev/sde1

root@ubuntu:~# cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md0 : active raid1 sde1[2](S) sdb[0] sdc[1]
      16777152 blocks [2/2] [UU]
unused devices: <none>

root@ubuntu:~# mdadm --detail --scan --verbose
mdadm: metadata format 00.90 unknown, ignored.
ARRAY /dev/md0 level=raid1 num-devices=2 metadata=00.90 spares=1 UUID=635b4199:952d0adb:e368bf24:bd0fce41
   devices=/dev/sdb,/dev/sdc,/dev/sde1

root@ubuntu:~# cat /etc/mdadm/mdadm.conf
# mdadm.conf
#
# Please refer to mdadm.conf(5) for information about this file.
#
# by default, scan all partitions (/proc/partitions) for MD superblocks.
# alternatively, specify devices to scan, using wildcards if desired.
DEVICE partitions
# auto-create devices with Debian standard permissions
CREATE owner=root group=disk mode=0660 auto=yes
# automatically tag new arrays as belonging to the local system
HOMEHOST <system>
# instruct the monitoring daemon where to send mail alerts
MAILADDR root
# definitions of existing MD arrays
# This file was auto-generated on Thu, 23 Oct 2014 12:22:23 +0400
# by mkconf $Id$
ARRAY /dev/md0 level=raid1 num-devices=2 metadata=00.90 spares=1 UUID=635b4199:952d0adb:e368bf24:bd0fce41
   devices=/dev/sdb,/dev/sdc,/dev/sde1

root@ubuntu:~# reboot

root@ubuntu:~# cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md_d0 : inactive sde[1](S)
      20971456 blocks
md0 : active raid1 sdb[0] sdc[1]
      16777152 blocks [2/2] [UU]
unused devices: <none>