I’m upgrading from 2 “My Book Live Duo”, a few “3TB My Book USB3” and some HD from a desktop that died.
My new PR 4100 has 2 x 8TB drives set up as RAID 1. What I would like to do is use one of the spare bays to install random drives that already contain data and copy that data to the RAID 1 volume.
Is this possible, what RAID mode would I use, and would I loose and data on the current RAID 1 by changing modes? BTW, I use a mac if that matters. Thanks!
Yes it is possible.
Create your 2 disk RAID1 volume first.
Insert a 3rd disk with data on it.
Use SSH and do this
Show file systems
If your 3rd disk is not mounted yet, you could do this (assuming data on 1st partition of /dev/sdc)
mkdir -p /mnt/somedisk
mount /dev/sdc1 /mnt/somedisk
Copy your data e.g. to your Public share
rsync -a --progress /mnt/somedisk /shares/Public/backup
Finally umount your disk
Ensure all /dev/sdc partitions are unmounted
And remove the disk again.