Moved Plex to New DiskStation, now Transcode Fails "Couldn't find the file to stream"

Plex Media Server NAS & Devices
5

If I may augment here,

DSM (Operating System) permissions are independent of PMS (the program).
They do not migrate from system to system.

Also, when moving from Diskstation to Diskstation, there is both an easy way and a hard way.

The easiest way:

  1. With PMS stopped
  2. Rename the Library which exists on the new to Library.old (skip this step if none)
  3. Copy in the contents of the Plex share from the other system
  4. Remove and reinstall the PMS package.
  5. Do not let it autostart after installation.
  6. When the drives quiesce again, now you can start it.

This works because:

  1. The installer checks the ownership of the files in Library.

  2. If you are copying from a different system, the owner ID (UID) is almost always different.

  3. The installer sees this difference and silently corrects it during installation. Rather than having the installer hang while installing (I can’t send a popup message), I dispatch the permissions change to the background (runs just as fast) so the DSM installer can exit.

  4. When the permissions are in sync with the new system, PMS can be started without error.

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