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[root@CentOS-69-64-minimal ~]# mdadm --fail /dev/md0 /dev/sdb1
mdadm: set /dev/sdb1 faulty in /dev/md0
[root@CentOS-69-64-minimal ~]# mdadm --fail /dev/md1 /dev/sdb2
mdadm: set /dev/sdb2 faulty in /dev/md1
[root@CentOS-69-64-minimal ~]# mdadm --fail /dev/md2 /dev/sdb3
mdadm: set /dev/sdb3 faulty in /dev/md2
[root@CentOS-69-64-minimal ~]# mdadm --remove /dev/md0 /dev/sdb1
mdadm: hot removed /dev/sdb1 from /dev/md0
[root@CentOS-69-64-minimal ~]# mdadm --remove /dev/md1 /dev/sdb2
mdadm: hot removed /dev/sdb2 from /dev/md1
[root@CentOS-69-64-minimal ~]# mdadm --remove /dev/md2 /dev/sdb3
mdadm: hot removed /dev/sdb3 from /dev/md2


[root@CentOS-69-64-minimal ~]# mdadm --zero-superblock /dev/sdb1
[root@CentOS-69-64-minimal ~]# mdadm --zero-superblock /dev/sdb2
[root@CentOS-69-64-minimal ~]# mdadm --zero-superblock /dev/sdb3

[root@CentOS-69-64-minimal ~]# mdadm --create /dev/md100 --level=1 --raid-devices=2 missing /dev/sdb1 
[root@CentOS-69-64-minimal ~]# mdadm --create /dev/md101 --level=1 --raid-devices=2 missing /dev/sdb2 
[root@CentOS-69-64-minimal ~]# mdadm --create /dev/md102 --level=1 --raid-devices=2 missing /dev/sdb3 
[root@CentOS-69-64-minimal ~]# mkswap /dev/md100
[root@CentOS-69-64-minimal ~]# mkfs.ext3 /dev/md101
[root@CentOS-69-64-minimal ~]# mkfs.ext4 /dev/md102 
[root@CentOS-69-64-minimal ~]# wget http://download.openvz.org/template/precreated/centos-7-x86_64-minimal.tar.gz
[root@CentOS-69-64-minimal ~]# mount /dev/md102 /mnt/
[root@CentOS-69-64-minimal ~]# mkdir /mnt/boot
[root@CentOS-69-64-minimal ~]# mount /dev/md101 /mnt/boot/
[root@CentOS-69-64-minimal ~]# cd /mnt/ ; tar xvfp /root/centos-7-x86_64-minimal.tar.gz 
[root@CentOS-69-64-minimal mnt]# for i in dev sys proc; do mount --rbind /$i /mnt/$i;done
[root@CentOS-69-64-minimal mnt]# cp /etc/resolv.conf /mnt/etc/
[root@CentOS-69-64-minimal mnt]# chroot /mnt/
[root@CentOS-69-64-minimal /]# yum install grub2-pc
[root@CentOS-69-64-minimal /]# yum install kernel.x86_64 mdadm
[root@CentOS-69-64-minimal /]# dracut -f /boot/initramfs-3.10.0-693.21.1.el7.x86_64.img 3.10.0-693.21.1.el7.x86_64

[root@CentOS-69-64-minimal /]# grub2-mkconfig  > /boot/grub2/grub.cfg
[root@CentOS-69-64-minimal /]# grub2-install  /dev/sdb
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