How to easily migrate a Synology EXT4 volume to Btrfs without data loss

Today I switched from a Synology DS215play to a DS918+. Perfect time to change the file system – the DS215play didn’t support Btrfs. The migration also works with only one device. So I wrote down both ways.

Steps if you haven’t changed your DiskStation:

  1. Backup your data! If you switch to a device with new drives like me, you still have a copy of your data, but if you migrate without new drives, you don’t have a copy! In germany we say: No backup – no pity.
  2. Shut down the DS, remove drive 2. Format drive 2 with your computer.
  3. Turn the DS back on and DO NOT repair the fault volume.
  4. Create a new volume (SHA and Btrfs) in the Storage Manager on drive 2.
  5. For each shared folder, change the location to the new volume. You can only do this for one shared folder at a time and the move may need several hours depending on the size of your shared folders.
  6. When you have moved all the shared folders, shut down your DS and remove drive 1.
  7. Format drive 1 with your computer.
  8. Turn on your DS and go to the Package Center. Repair all apps.
  9. Expand your new volume to drive 1 and wait until RAID Resync is complete. You’re done.

Steps if you are switching to a new DiskStation with new drives (my situation):

  1. Turn off your old DS, remove drive 2.
  2. In the new DS, place the new drives in slot 1 and 2. Place the (old) drive 2 in slot 3.
  3. Turn on the new DS. Open your browser and navigate to the new DiskStation. In my case, the DS got a new IP address. I looked them up in my router DHCP table.
  4. Follow the Migration Wizard and wait until the DS restarts.
  5. Create a new volume (SHA and Btrfs) in the Storage Manager on drive 1 and 2. It is now recommended to change the RAID Resync speed to Fast and wait until RAID synchronization is complete.
  6. Now for each shared folder, change the location to the new volume. You can only do this for one shared folder at a time and may need several hours depending on the size of your shared folders.
  7. When you have moved all shared folders, shut down your DS and remove drive 3.
  8. Turn on your DS and go to the Package Center. Repair all apps. You’re Done.

Run command in background on a Synology NAS with nohup

To run a programm  that doesn’t quit if you close the ssh session use nohup (no hangup). Attention, you have to run it as root for it to work!

Install IPKG on a Synology DS415play

I search for a easy guid to install ipkg on my Synology DS415play with Intel Atom CPU. I found a guid by Edward P:

Connect to your NAS as root through SSH
Go to a temporary folder, for example:

Download the bootstrap script:

Make the downloaded script file executable:

Execute the bootstrap script:

Installation should now be completed. To test it, run:

Enjoy.

Erase and overwrite Disk on Synology DiskStation

I wanted to erase and overwrite the data on some hard disks that I need to downgrade my RAID 5 from three 4TB WD Red to only two. The erase function on the webgui doesn’t work – something message like “don’t possible with your drive”. I search and found an alternative:

To identify the disk use fdisk and/or hdparm:

To run the dd command furthermore after disconnection from the SSH connection, use nohup: