Today the server crashed. It ran out of disk space. I have now added another 400Gb (it was originally 50Gb) so this shouldn’t happen again (at least not for a long time).
Another server crash last night. Couldnt see why this happened. A restart was successful and all servers are up and running again. The only thing I can think of is the NAS was running too slow while it was re-striping the disks. Its still running this process and probably will be for another day or so. Hopefully it wont take out the server again.