Reclaiming Drives to Build a New RAID
A couple years ago, I replaced my old spinner drives with matching SSDs. I left the old drives mounted but disconnected the cables. I’ve been watching my photo collection grow and consume about half my live storage, so I figured it was time to bring those slower spinning drives back online, so I can move my archive of old photos off my fast drives and get a little extra room.
I plugged in the first drive,
and observed that it fortunately did not try
to join the existing RAID arrays.
lsblk showed me a list of drives and partitions
and how they were currently used,
so I could confidently
to wipe and recreate 1 primary partition on the drive
fd (Linux raid autodetect).
I rebooted to see the new partition table,
and then installed and did the second drive
/dev/sdb in my case).
I setup the new drives in a mirror:
# create a new RAID1 mirror out of those new partitions: mdadm --create /dev/md2 --level 1 --raid-devices=2 /dev/sda1 /dev/sdb1 # to ensure it's still called md2, and not md127 on reboot update-initramfs -u # create a filesystem mkfs -t ext4 /dev/md2 # mount it to copy mkdir /mnt/new mount /dev/md2 /mnt/new # migrate all my photos rsync -av /home/john/Photos/ /mnt/new
After the initial migration, I tested it:
Checked that the array is there with the same name:
cat /proc/mdstat(It initially had not kept the name, and that’s when I learned to
Mounted the new array as
Checked that Digikam still works.
That looked good, so it’s time to make it permanent:
Unmounted the new filesystem
Deleted all the old contents of
Added the new array to the
/etc/fstabto mount it automatically