MergerFS - replace a drive

MergerFS is a great utility for combining JBOD into one volume. https://github.com/trapexit/mergerfs

Used with snapraid, we have a reasonably robust media server.

The github repo has instructions for disk replacement in the docs, for example:

but I want to use the same mount point so will edit the /etc/fstab and reboot.

Replacing an old drive

disable snapraid in the crontab
copy the data from the old drive to the replacement drive at a temporary mount point, eg:
```
 sudo rsync -avPHAX /mnt/disk1/ /media/usb/
```
remove the old drive from the machine.
update /etc/fstab so the uuid of the new drive replaces the old drive.
reboot - the new drive has replaced the old drive and is mounted at the same point
enable snapraid in crontab
run snapraid touch
run snapraid sync