Willion

All is resolved now. I suspect that an underpowered PSU was causing CRC issues on one of the disks during the data rebuild. After replacing the PSU and two of the disks just stopped working completely and another was being flaky I remembered that three of my disks are susceptible to the 3.3V Pin issue and I had previously avoided that problem with some SATA to Molex to SATA cables with the old PSU. So, I then addressed the 3.3V Pin issue with a power cable mod. The array has been rebuilt and all is good now. Thank you for the help, much appreciated.

I've not seen power splitters mentioned before as a potential problem. I think I do have some splitters in there in there so I'll take a look and remove them if I can. The power supply is a new one from a year ago, a Thermaltake 80 Plus Smart500W, I'll see if it has enough connections without splitters. I have seated and reseated those cables but I'll do it again. Thank you.

Done, they are now attached to my original post. Thank you.

Unraid 7.3.2. I can’t keep up with my Unraid problems. I go from one disk error situation to the next. I have five spinning drives (one for parity) and an SSD cache. Fairly regularly I get errors pointing to a bad cable or cable connection. I shut down the array, shut down the system, reseat the cable, start up, run SMART test, comes out good, rejoin and rebuild the array. Which is usually a two or three day process in total. After the latest one on Disk2 (sdd) I replaced both internal SATA cables. Then I ran the extended (16 hrs) SMART test and it came out good. So I reinsert the disk into the array and start the rebuild and now I’m getting errors not only on that Disk2 but on another one as well. I’ve attached a file with the log for Disk2 below. I’ve had this system for years and granted there have been many months and months of trouble-free operation, but then sometimes feel like I’m chasing false errors on and on. I was running Plex on it but got tired of it being unavailabe and moved it. Could my controller be bad? Any ideas? Unraid homebuilt in a Rosewill tower case with Unraid 7.3.2 Five drives, one 2 TB, two 8 TB, one 10 TB, one 12 TB, with the 12 TB as parity. Mostly older HGST Helium drives. Z390 Aorus Elite i5-9500T 32 GB RAM Hard drive controller: LSI SAS2008 SAS/SATA PCI-Express card PNY Quadro 400 One 1 TB Sandisk SSD caching drive Unraid disk2 errors.rtf descartes-diagnostics-20260806-1030.zip

I should have mentioned that I have at least 5,000 of those read errors, maybe more because my syslog was full. I have increased my syslog size and it will be permanent upon the next reboot. Dec 23 07:00:46 Descartes kernel: md: disk0 read error, sector=736716856 Dec 23 07:00:46 Descartes kernel: md: disk0 read error, sector=736716864 Dec 23 07:00:46 Descartes kernel: md: disk0 read error, sector=736716872 Dec 23 07:00:46 Descartes kernel: md: disk0 read error, sector=736716880 Dec 23 07:00:46 Descartes kernel: md: disk0 read error, sector=736716888 Dec 23 07:00:46 Descartes kernel: md: disk0 read error, sector=736716896 Dec 23 07:00:46 Descartes kernel: md: disk0 read error, sector=736716904

How do I fix a power/connection issue? FYI, the power supply was recently replaced because it went bad.

Attached wrong file on initial post, here is the Diagnostics file attached. Thank you trurl. descartes-diagnostics-20251223-0724.zip

Any help is much appreciated, Unraid newb for the most part here. Getting these errors in syslog: kernel: md: disk0 read error, sector=736711744 Fix Common Problems says: Can it be determined if the Parity disk is bad or it is the cabling? If it is a bad disk should I wait to replace it because I am in the process of replacing a data disk and it is still preclearing (taking forEVER)? If it is a cabling issue is it recommended to just replace the cable? I have checked that the connection is tight. Diagnostics attached. TIA descartes-smart-20251223-0815.zip