I am not familiar with Kingston A400, but Samsung EVO / PRO will be faster than HDDs but still painfully slow, as well pose a significant threat for data loss on power failure. Take a look at intel D3 SSD line of disks and similar. Just look at the enterprise SSDs from any provider really. They...
Well, sorry to disappoint, but 2 x HHDs in mirros on ZFS will always be painfully slow in my experience.
The first usable config with HDDs in my use cases is at minimum of 10 HDDs.
However what you could try is:
1. Enable SLOG for pool (create partitions on ssds and add them as log device for...
Oh, are there... ok I didn't notice. Thanks for pointing it out. Maybe there were some hanging processes then and systemd finally decited to reboot the server after 30 minutes.
IPMI has stopped working all together, I can not access it.
I can not reboot these servers just to test it out, so we...
When copying to ZFS HDD Mirror and at the same time using it for Windows will always result with the symptoms you describe, because two HDD disks are simply to slow (IOPS wise) for what you want them to do.
The only thing that might help is to disable syncing (ZIL) on windows HDD...
I concur, that is why i mentioned it.
The system might have waited for IMPI which failed to run and continued to boot Linux after some timeout.
IPMI is on dedicated network interface.
Logs show a clean shutdown from Linux point of view.
I just have had the same experience right now with the same Supermicro AMD hardware type but on a different server.
Took exactly 30 minutes to come back. I failed to access IPMI or attach screen in time.