Yesterday, 05:55 PM
Your migration plan is sensible, and the sequence you outlined will work safely. The key is that you never rely on the old RAID1 disks during the rebuild and you always copy the data first while the Synology pool is still healthy. UGREEN can grow arrays, but starting from a clean state is always safer.
Your original idea is fine, but here’s the cleanest and safest flow:
Start the DXP4800 Plus with one new drive and initialize it in basic mode. Connect both NAS units on the network and copy your data from the DS225 Plus to the new UGREEN volume using rsync or File Station. Once the data is fully copied, take one of the old 6TB drives out of the Synology and place it in UGREEN. Reformat it and convert the UGREEN pool into RAID1. After that rebuild completes, take the second Synology 6TB drive, add it to the UGREEN, reformat it, and expand the array from RAID1 to RAID5. This gives you a clean migration path without ever risking your source data.
If you want a faster option, you can begin by creating RAID1 straight away using one new drive and one of the old drives, then copy the data from the remaining Synology disk, and finally add that last disk to migrate RAID1 into RAID5. Both routes work, but the first method is the safest because the Synology remains untouched until the data is fully copied.
Also possible to faster copy data using USB SATA docking station. https://amzn.to/4q7UfiK
Your original idea is fine, but here’s the cleanest and safest flow:
Start the DXP4800 Plus with one new drive and initialize it in basic mode. Connect both NAS units on the network and copy your data from the DS225 Plus to the new UGREEN volume using rsync or File Station. Once the data is fully copied, take one of the old 6TB drives out of the Synology and place it in UGREEN. Reformat it and convert the UGREEN pool into RAID1. After that rebuild completes, take the second Synology 6TB drive, add it to the UGREEN, reformat it, and expand the array from RAID1 to RAID5. This gives you a clean migration path without ever risking your source data.
If you want a faster option, you can begin by creating RAID1 straight away using one new drive and one of the old drives, then copy the data from the remaining Synology disk, and finally add that last disk to migrate RAID1 into RAID5. Both routes work, but the first method is the safest because the Synology remains untouched until the data is fully copied.
Also possible to faster copy data using USB SATA docking station. https://amzn.to/4q7UfiK