Hi all!

I'm currently running Unraid v6.12.3. I have two 10TB parity disks and ten 3-10TB data drives. Last week, one of my 3TB data drives was giving me errors, so I bought a 10TB renewed drive as a replacement (I actually bought 3 of them to finally replace all of the 3TB drives).

I followed the FAQ for replacing a disk drive, but my data-rebuild keeps failing or stalling out. The rebuild only gets to ~2% and then my writes to the replacement drop to zero and the whole thing starts to crawl (it has even crashed Unraid a few times and required me to hard-restart using the PSU). During the subsequent restarts, I've been getting random UDMA CRC errors on other drives and I'm now unclear on what the real problem is (bad memory, bad HBA breakout cables, PSU issues, etc)? When it gets to this point, I can't even reboot pause/cancel the rebuild nor restart/power-off the server.

I've uploaded my diagnostic file for review. Any feedback or guidance on how to troubleshoot would be appreciated.

Disk 9 (rebuild) no longer writing after ~2%:

renfrewnas-diagnostics-20250814-1714.zip

Unraid driver is crashing; this is typically a hardware issue. Start by running memtest.

If nothing is found, upgrade to 7.0.1 or 7.1.4 and retry; the different kernel might help if it's a compatibility issue, which, although rare, has happened before.