I just added a new software raid and waited till it got completely synced. Afterwards I created an ext4 filesystem. As soon as this has been finished I wanted to mount the filesystem. This gave me an error in the web interface (502 - bad gateway). My server rebooted itself (slowly) afterwards. Slowly means it did not disappear immediatly, but slowly shut down and rebooted.
After the reboot the web interface showed me a pending change. When I tried to apply it now, it rebooted again. When I dismissed it, everything was fine, except it was not mounted. I could not find anything suspicious in the syslog.
When I use salt to deploy fstab, the drive is mounted, but I cannot add a shared folder.