I am using omv4, snapraid, unionfs with ext4...
Been having trouble logging in - not accepting passwords, but just relooping to loggin without erros. Logged in ssh as root and tried omv-first to change password. This failed, saying there was no disk space. The OS disk is ssd 120gb, so doesn't seem that this would be full.
From omv-firstaid ran apt clean, now login gives me this:
OMV\Exception: Failed to read file '/var/cache/openmediavault/cache.omv\controlpanel\login_js.json' (size=0). in /usr/share/php/openmediavault/json/file.inc:207
I can see files from other computers. I have re-booted several times from the ssh interface, but the error does not change...