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Raspberry Pi – RAID 1 with NFS

I decided to give my Raspberry Pi a new life and installed the latest version of Raspbian.
I also ordered two similar usb sticks of the same size to make a raid 1 (mirrored) device with mdadm which I want to export with NFS.
Note that you should be knowing what you are doing since any of these steps might lead to data loss.

# Short session as root
sudo -i
# Determine where the usb sticks are.
fdisk -l
# Remove existing partitions and create the new Linux partitions. Combination of the following commands: p, d, n and w
fdisk /dev/<usb-device1>
fdisk /dev/<usb-device2>
# Install adm. When asked about installing it to the root os answer with 'none' since we will keep booting from the sd card.
apt-get install mdadm
mdadm --create --verbose /dev/md0 --level=mirror --raid-devices=2 /dev/<usb1-partition1> /dev/<usb2-partition1>
# Check if everything is ok.
mdadm --detail /dev/md0
# Write stuff to the mdadm config
mdadm --detail --scan >> /etc/mdadm/mdadm.conf
# Create the fs (-m 0 = no reserved blocks)
mkfs.ext4 -m 0 /dev/md0
mkdir /mnt/raid
mount /dev/md0 /mnt/raid
# I copied the directories I wanted to move over to the raid device (/var, /tmp, /opt, /root)
# copy var without the symlinks use the same command for the other directories.
find /var -depth -type f -o -type d | cpio -pamVd /mnt/raid
# Determine the uuid of the raid device to be used in fstab
blkid /dev/md0

Edit fstab to mount everything from the raid device.

UUID="<your_raid_uuid>"        /mnt/raid       ext4    defaults,noatime        0       2
/mnt/raid/var   /var            none    defaults,bind           0       0
/mnt/raid/tmp   /tmp            none    defaults,bind           0       0
/mnt/raid/root  /root           none    defaults,bind           0       0
/mnt/raid/home  /home           none    defaults,bind           0       0
/mnt/raid/opt   /opt            none    defaults,bind           0       0

Next I installed nfs and created a dir for the nfs shares.

apt-get install nfs-kernel-server
# Don't forget to start rpcbind. Otherwise you will have strange problems connecting to your nfs share from other machines. (Connection timed out most probably)
service start rpcbind
mkdir /mnt/raid/share
mkdir /export
cd /export
ln -s /mnt/raid/share

Edited /etc/exports

/export/share ,sync,no_subtree_check)
# export everything. Restart nfs to be certain our changes made it.
exportfs -r
service nfs-kernel-server restart

Well that’s it for now. I will be testing this to see how it holds up on my Raspberry.

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