Migrating Plex from old hardware and software Synology (6.2) system to new (7.1)

Plex Media Server NAS & Devices
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It can’t see inside the Plex shared folder

There are a lot of steps to this. You can’t miss any / short circuit it.

Go here:

Starting with Step 3 where you give PlexMediaServer Full Control of the Plex shared folder

Be certain to check the box “Apply to this folder, sub-folders and files” or the migration will fail with “System error 0”.

This will take time to complete.

AFTER the permissions have been set.
WITH all your metadata still in the Plex shared folder
UNINSTALL the DSM 7 app with the ERASE option

This removes the empty PMS install which is there now.
The installer won’t migrate if it sees anything in the PlexMediaServer shared folder.

With it uninstalled + erased - Install again.

This time, It will automatically start migrating.

It can’t print any messages (DSM limitation).

All you will see is “Installing”.

  1. Don’t interrupt it
  2. Don’t refresh or migrate away from the browser page until it’s done.

If you wish to check on its progress.

  1. Open a new tab to the Syno
  2. Open the Plex shared folder
  3. After about 3 minutes, a file “Migration.log” will appear
  4. This logs the installation & migration progress.
  5. When it’s complete, you’ll see it “Cleaning /volume1/Plex”

Now you’re good and your server should be there and ready for you