2022-09-09: Decommissioned by Steve Kemp.

Provisioned with a basic Ubuntu 14.04 system. After provisioning RAID was set up like this:

# apt-get install mdadm
# mdadm -E /dev/sd[a-d]
mdadm: No md superblock detected on /dev/sda.
mdadm: No md superblock detected on /dev/sdb.
mdadm: No md superblock detected on /dev/sdc.
mdadm: No md superblock detected on /dev/sdd.
# mdadm --create /dev/md0 --level=10 --raid-devices=4 /dev/sd[a-d]
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md0 started.
# mkfs.ext4 /dev/md0
mke2fs 1.42.9 (4-Feb-2014)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=128 blocks, Stripe width=256 blocks
244183040 inodes, 1953443584 blocks
97672179 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4294967296
59615 block groups
32768 blocks per group, 32768 fragments per group
4096 inodes per group
Superblock backups stored on blocks: 
	32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 
	4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968, 
	102400000, 214990848, 512000000, 550731776, 644972544, 1934917632

Allocating group tables: done                            
Writing inode tables: done                            
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done
# mdadm --detail --scan --verbose >> /etc/mdadm.conf

Copying data from old RAID on bt02srv:

# rsync -av --partial --progress --human-readable /mnt/backup 172.26.23.2:/mnt/