Not sure this will be relevant but your system of 12 cards using one 850 psu for the risers is how I killed two psu. I only had 7 cards running and it was too much for the Sata channels to handle. One psu will be good for 6 sata devices so I think you are browning out the main psu. Once I dropped back on card count, no more problems. In the end, I gave up on the Server psu's and went with dual 1000w psu's.
thay
The 850W PSU only runs the motherboard and one card and it's riser. I have three PSU's per rig. Two 1600W (6 cards and their risers each) and the 850W as described. I am no were near the amount of power the power supplies are capable of, so should be good there.
This is one of the rigs -
https://imgur.com/a/WRfTksJThat is a really nice (and big) rig. Did you find anything in syslog (as per my previous post)?
m1@m1-desktop:~$ sudo less /var/log/dmesg
(Nothing has been logged yet.)
Is all I get. I am using 19.2
There are lots of logs in there. In particular, I would like to see what was logged to syslog at the times when it freezes. You should find about a week's worth, some gzipped up:
m1@Testy:/var/log$ ll sys*
-rw-r----- 1 syslog adm 4328 May 3 15:38 syslog
-rw-r----- 1 syslog adm 12251 May 3 07:35 syslog.1
-rw-r----- 1 syslog adm 2729 May 2 07:35 syslog.2.gz
-rw-r----- 1 syslog adm 104280 May 1 07:35 syslog.3.gz
-rw-r----- 1 syslog adm 2448 Apr 30 07:35 syslog.4.gz
-rw-r----- 1 syslog adm 2928 Apr 29 07:35 syslog.5.gz
-rw-r----- 1 syslog adm 51881 Apr 28 05:39 syslog.6.gz
-rw-r----- 1 syslog adm 105756 Apr 27 07:35 syslog.7.gz
Both my rigs have no logs. Neither are set to clear logs on reboot, so they should be there if they are. Only logs I have seen are the ones I posted that show up in miner_watchdog
m1@m1-desktop:~$ /var/log$ ll sys*
bash: /var/log$: No such file or directory