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Cake day: July 10th, 2023

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  • I don’t have a Synology, but I implemented SHR manually using mdadm. If you have a RAID 1 array you can just add disks to it and “upgrade” it to the next tier of your choice. So with 3 disks you could just go to RAID 5 and that chunk would now become RAID 5.

    It wouldn’t be merged with any additional chunks directly. Rather, you’d use LVM to create a volume group with each chunk added (each chunk world be formatted into a PV). From that you would carve out your volumes and then your file systems on top of that.

    This is a pretty simple layout and I imagine Synology is pretty close to this.

    The best way, I found to do this is to actually first partition your drives into 2-4TB chunks. Each of these partitions is then added to a RAID array, minimizing waste if you have mixed size drives. e.g. with three disks the first partitions are grouped into one raid array (chunk) and then the second partition of each disk is grouped into the next array, etc.