Same here: syslog is full of
rrdcached plugin: Failed to connect to RRDCacheD at unix:/var/run/rrdcached.sock: Unable to connect to rrdcached: No such file or directory (status=2)
Thus I ran omv-firstaid (command line) and chose 'Check RRD database'. This gives:
Checking all RRD files. Please wait ...
State file '/var/lib/monit/state': Unable to truncate
All RRD database files are valid.
'rrdcached' start: '/bin/systemctl start rrdcached'
'rrdcached' failed to start (exit status 0) -- no output
ERROR: Command '['monit', 'start', 'rrdcached']' returned non-zero exit status 1
root@nas11:~# 'rrdcached' start: '/bin/systemctl start rrdcached'
root@nas11:~# 'rrdcached' failed to start (exit status 0) -- no output
This is on OMV 4.1.35-1 (Arrakis)
Any clues how to get rid of this?