wilsonhomelab
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wilsonhomelab's post in disk1 disable (after huge read errors), but content not actually emulated by parity drive was marked as the answerI think I finnally found the culprit. The I/O errors actually came from, I believe, the insufficient sata power. I used a molex-to-2x-15-pin-sata cable to power the silverstone 5HDD hot-swag cage due to the clerance problem. And I never ran into problems untill I populated all 5 HDD into a single cage (I have two of the cages). I found a simular issue, which prompted me to try power the cage with two dedicated sata cable straigh from the PSU.
THE end result is that the disk 1 was pre-clear at double of data rate at 200+MB/s instead of 90MB/s . The rebuild process was done in 10 hrs with average 202MB/s. I wish the system log could be more precise about the I/O error (" hard resetting link") , or the drive itself should have reported under-power issue. I hope this will be helpful for someelse.