if this happens get to know the database/Indexing features within their sub menus.
After the first week, Plex kept showing all kinds of prompts with no access to the data.
Be sure you know how to Optimize, Rescan, Rebuild etc within Plex settings. We made a group for TV Shows, Films, Music Videos, and so on. Lastly, if you have tons of files like we do and use Plex, its best to make separate libraries vs. Plex is hit or miss whereas VLC plays anything and everything. No more issues with Plex not being able to decode or relyingg only the NAS drives performance which is simply oK.there's nothing worse than when technology doesn't work. VLC plays anything including DTS Audio WAV files and the file gets processed on the tablet and also the NAS drive. Pull up the VLC (Video Lan) player software on the tablet and open files directly on the NAS drive. Configured the output from the tablet to 3840 resolution so that it properly matches our large 4K screen.
The software is good to an extent but in our case, I bought a Miniport to HDMI cable and plugged it straight away from our Surface Pro tablet into our Denon AV Receiver. Loads of network errors, can't process a video errors and so on. There's too much to list here but be sure if you run into troubles, to check their support page. If buying this in the hopes of using the Plex software on all of your devices, well that's where the challenges come in. Be sure and explore all of these options and disable what's not necessary. The WD software is quite good there's everything from turning off the LED's, to hibernate mode to Power saver mode. We don't use the NAS to stream to our phone as its more for home entertainment on large screen TV's and backup. Streaming across the network works quite well in this scenario as well as on a wireless Surface Pro tablet.
We have CAT 5e cabling in our home with CAT6 wires and gigabit ports on all of our harwired devices. So if one drive fails, the other will work until it can be replaced. ID Mirror which is live duplication onto a secondary drive. The out of the box configuration is setup for RA. Be sure to keep this in a location where reasonable air circulation is available. There are a variety of ports that need to be opened such as 32400 (main port - others are optional). First, if you are not familiar with the intricacies of routers, IP addresses, firewalls and network permissions etc, You may require proper help with setup.