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OP Currently has in their possession 2 drives.
OP has confirmed they're 12TB each, and in total there is 19TB of data across the two drives.
Assuming there is only one partition, each one might look something like this:
OP wants to buy a new drive (also 12TB) and make a RAID5 array without losing existing data. Kind of madness, but it is achievable. OP buys a new drive, and set it up as such:
Then, OP must shrink the existing partition to something smaller, say 10TB for example, and then make use of the rest of the space as part of their RAID5 :
Now with the 3x 2TB partitions, they can create their RAID5 initially:
sudo mdadm --create --verbose /dev/md0 --level=5 --raid-devices=3 /dev/sda2 /dev/sdb2 /dev/sdc1
Make ext4 partition on md0, copy 4TB of data (2TB from sda1 and 2TB from sdb1) into it, verify RAID5 working properly. Once OP is happy with the data on md0, they can delete the copied data from sda1 and sdb1, shrink the filesystem there (
resize2fs
), expand sda2 and sdb2, expand the sdc1, and resize the raid (mdadm --grow ...
)Rinse and repeat, at the end of the process, they'd end up having all their data in the newly created
md0
, which is a RAID5 volume spanning across all three disks.Hope this is clear enough and that there is no more disconnect.
The number of drives doesn't matter when you can't copy to another. There is no replication path here.
You seem to be under the impression that the "buckets" in this case are all or nothing. They are talking about partitioning the drives and raiding the partitions. The way he describes slowly moving data to an ever increasing raid array would most certainly work, as it is not all or nothing. These buckets have fully separate independent chambers in them that are adjustable at will. Makes leveling them possible, just tedious and risky.