Assuming /dev/sdb and /dev/sdc from the Syno:
Data is on partition 3.
mdadm --assemble --readonly /dev/md0 /dev/sdb3
Follow by:
mount -o ro /dev/md0 /mount-directory
I think I may of found the link
It may of been this section with the assumption you have already created the place to mount it to,
It looks like you have a new 2gig, non-RAID disk and you’re trying to read the contents of an old 750gig RAID disk. If that’s the case, you can do something like this:
ls -l /dev/md/
In our case, this returned the following:
total 0 lrwxrwxrwx 1 root root 8 Jul 26 08:30 sp:0 -> ../md126 lrwxrwxrwx 1 root root 8 Jul 26 08:30 sp:1 -> ../md127
I was then able to mount the partition I needed for reading:
mount /dev/md/sp:0 /mnt
In the case above, sp:0 and sp:1 I believe are what I named the RAID partitions at the time of creation.
I know where you copied that from 
If you assemble the RAID from the individual partitions, you don’t need to specify them in the mount.
What you have above is when working with mixed sizes
OK, so your help was invaluable Chuck, thank you. New server up and running, content moved to new NAS, Plex server installed from Plex download and not from Synology app store, people can connect and watch films remotely. Everything is super…
All but one thing. When I now open the Plex app from within the Synology DiskStation, I can see all my libraries etc. but the minute I try to do anything including admin tasks, I get whats on the image here. No soup for you, you do not have access to this server. I checked and I am signed in correctly with my Plex Pass account.
Any help would be appreciated.
Think I solved it by signing out and in again. However I can remember what I was doing when it crashed.
I had uploaded 1700 music albums. Scanned the library and it brings back only 1007. The size on the server seems smaller too compared to what I uploaded. Tried to copy again using the skip file if it exists function which it completed. Files copied across are the same quantity as whats now on the server, yet it still only shows 1007 albums. Attempted to re-scan library several times but same result.
Am I missing something?
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