There are two common problems with Docker volumes: Paths that differ between the Sonarr and download client container and paths that prevent fast moves and hard links. The first is a problem because the download client will report a download's path as /torrents/My.Series.S01E01/, but in the Sonarr container that might be at /downloads/My. Docker can be an alternative to virtual machines. If you don't have enough memory to run virtual machines on your Synology NAS, you can run Docker containers instead. Docker containers require a very little amount of memory and system resources to run. Running Docker Containers on Synology NAS is explained in this article.
Sonarr is supported natively on Windows. Sonarr can be installed on Windows as Windows Service or system tray application.
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Sonarr can be installed as system tray application or Windows Service. A system tray application is started after the user logs in and is visible as an icon on the taskbar system tray.
A Windows Service runs even when the user is not logged in, but special care must be taken since Windows Services cannot access network drives (servershare or X: mapped drives) without special configuration steps.
Additionally the Windows Service runs under the 'Local Service' account, by default this account does not have permissions to access your user's home directory unless permissions have been assigned manually. This is particularly relevant when using download clients that are configured to download to your home directory.
It's therefore advisable to install Sonarr as a system tray application if the user can remain logged in. The option to do so is provided during the installer.
Updating Sonarr v2 to v3
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Sonarr v3 will automatically convert the existing Sonarr v2 installation. Sonarr v2 stored it's database in C:ProgramDataNzbDrone, which will be automatically converted to C:ProgramDataSonarr.It's advisable to make a backup of the v2 data first.
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Sonarr v2 ran under the System account, which has far too many privileges. Sonarr v3 runs under the Local Service account, and will not have access to user's home directories. This may lead to unexpected behavior when you're using a download client thats configured to download to your home directory.If this applies to you, please install Sonarr to run as system tray application instead.