Created
January 11, 2011 13:56
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Build and verify a raid1 array from a single disk
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# format disk1, partition type fd | |
cfdisk /dev/vda | |
# copy partition table from disk1 to disk2 | |
sfdisk -d /dev/vda | sfdisk /dev/vdb | |
# check partitions | |
fdisk -l 2>/dev/null | grep -B1 '^\/dev' | |
# build array with only disk1 | |
mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/vda1 missing | |
# check array | |
cat /proc/mdstat | |
# format array | |
mkfs.ext4 /dev/md0 | |
# create array mount point | |
mkdir /mnt/raid | |
# mount array | |
mount /dev/md0 /mnt/raid | |
# save data to array | |
date > /mnt/raid/current-date | |
# check data | |
cat /mnt/raid/current-date | |
# save array conf | |
mdadm --detail --scan >> /etc/mdadm/mdadm.conf | |
# umount array | |
umount /dev/md0 | |
# stop array | |
mdadm -S /dev/md0 | |
# check if array is stopped | |
cat /proc/mdstat | |
# create single disk mount point | |
mkdir /mnt/single | |
# mount single disk | |
mount /dev/vda1 /mnt/single -t ext4 | |
# check if data is there | |
cat /mnt/single/current-date | |
# umount single disk | |
umount /mnt/single | |
# restart array | |
mdadm --assemble /dev/md0 | |
# check if array is up | |
cat /proc/mdstat | |
# add disk2 to array | |
mdadm --add /dev/md0 /dev/vdb1 | |
# check if array is rebuilding itself | |
watch cat /proc/mdstat | |
# mount array | |
mount /dev/md0 /mnt/raid | |
# check if data is there | |
cat /mnt/raid/current-date |
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