Hi!
My daughter decided to upload all her photos and videos to our NS7 NextCloud and filled the disk. Our NS7.9 + NextCloud was running in a VM on Proxmox.
First I increase the VM disk but that wasn’t enough for her files … 
So @Andy_Wismer suggested I move the NextCloud data from /var/lib/nethserver/nextcloud to the separate data disk attached to the NS7 VM. I created a sym link to the new data location and it restarted. All seemed to work OK.
The next day I got the following error
EXEC FAILED (/usr/sbin/sendmail): Resource temporarily unavailable
Also got the following in NextCloud admin yesterday 5 days later than the data move.
Last background job execution ran 4 days ago. Something seems wrong. Check the background job settings
I also have found this in the past day:
The PHP OPcache module is not properly configured. See the documentation
for more information.
The OPcache interned strings buffer is nearly full. To assure that repeating strings can be effectively cached, it is recommended to apply opcache.interned_strings_buffer to your PHP configuration with a value higher than 8.
The OPcache is set for 20, so I increased that to 50.
I’ve been searching for the solution to fix the EXEC error but no luck so far.
The only thing I’ve found is that this error has something to do with not enough virtual memory to fullfil cron’s job.
I’m not sure what to do to debug from there. Any suggestions welcome.
Thanks in advance.