I'm trying to upgrade my parity drive from 14TB to 26. I reach 14+ rebuilt and then my server reboots. I set up a syslog server and have it logging but there's nothing in the logs for the reboot time (even an hour beforehand), which I found odd. The latest rebuild attempt I saw 15.6TB ten minutes (approx) before the server rebooted.

Attached are diagnostics; I think I did it correctly.

tower-diagnostics-20250628-1729.zip

Reboots are generally a hardware problem. What PSU are you using are you using any power splitters? Have you ran an extensive memtest?

4 minutes ago, MowMdown said:

Reboots are generally a hardware problem. What PSU are you using are you using any power splitters? Have you ran an extensive memtest?

I'm using Supermicro chasses, one 12 bay which hosts the server itself, then a 45 bay JBOD chassis, both using 2 of the supermicro server PSU's (4 PSU's total). I'm going to try connecting the new parity to the motherboard sata port and see if that helps things.

The only power splitters I'm using are for the u2 to m2 converters (sata power splitters), so nothing for any other molex power connectors.

I haven't run a memtest but this is the first time I've gotten reboots while doing a parity rebuild in my 14 years of using Unraid; not saying it's NOT memory related, but I find it odd the issue just happened when I went to upgrade my parity drive.

It ended up being my HBA overheating. Those low rpm Noctuas don’t move enough air. I got better 120mm’s and put active cooling on my HBA and things have been fine.