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According to your diagnostics your syslog is being spammed with messages of the form:

May 21 10:45:25 server kernel: sd 7:0:18:0: [sdf] tag#110 UNKNOWN(0x2003) Result: hostbyte=0x00 driverbyte=DRIVER_OK cmd_age=0s
May 21 10:45:25 server kernel: sd 7:0:18:0: [sdf] tag#110 Sense Key : 0x5 [current] 
May 21 10:45:25 server kernel: sd 7:0:18:0: [sdf] tag#110 ASC=0x26 ASCQ=0x0 
May 21 10:45:25 server kernel: sd 7:0:18:0: [sdf] tag#110 CDB: opcode=0x42 42 00 00 00 00 00 00 00 18 00
May 21 10:45:25 server kernel: blk_update_request: critical target error, dev sdf, sector 941623360 op 0x3:(DISCARD) flags 0x0 phys_seg 1 prio class 0

with the sector number changing.   The sdf device appears to be your cache2 device.    This makes it sound as if it could be failing :( 

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I'm using a SAS controller for my disks. I had a bunch of errors on my ryzen board with the internal controller, and going SAS eliminated them.  I wanted to test the SAS cables.  Switching them did nothing.  I put the cache drives back on the internal motherboard controller, and I no longer have the error in my log. 

 

Recently, disk 2 was giving me errors, and an extended SMART test showed no errors.  This happens every 3 months.  Restarting fixes the issue.

 

It looks like I'm going to have to by a new SAS controller.  First, I'll wait and see if the disk 2 error shows up again.  Maybe having the cache drives and share drives on the same controller causes some kind of issue. 

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Yes but not running at the time. I'm thinking it could be the zoneminder docker.  htop with 100% cpu showed zmc process consuming 66% of the ram.  It seems like a docker issue. The other potential docker is crash plan pro.  I have it set to limit memory usage.  I'm going to try and monitor the ram and kill off a docker to see how much gets freed.

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