06-13-2025, 02:09 PM
Thanks for sharing your detailed setup and troubleshooting steps.
Given the errors persist even after replacing the WD Red drive with a new one of the same model, and now the new drive also faults during resilvering, this points toward a potential hardware issue outside the drives themselves.
Your plan to swap the drives to opposite SATA bays is a good next step. If the errors follow the drive, it’s likely a drive problem; if they stay with the bay, it could be the SATA controller or cabling.
Since you upgraded RAM from 8GB to 16GB DDR5 4800, and ZFS is very sensitive to memory issues, reverting temporarily to the original 8GB RAM is also smart. Faulty or incompatible RAM can cause silent data corruption or I/O errors under heavy loads like resilvering.
Other things to check or try:
Ensure the SATA cables and connectors are firmly seated and of good quality.
Check the UGREEN firmware/BIOS for updates that might fix storage stability issues.
Test the drives on another system to confirm they’re healthy.
Look into your power supply—unstable or insufficient power can cause write errors during heavy disk operations.
Review the kernel and ZFS logs carefully for any additional clues.
Try running some SMART self-tests on the drives to confirm drive health.
Since you disabled the onboard eMMC and watchdog, ensure that these changes aren’t impacting stability unexpectedly.
Overall, my guess is either a faulty SATA port/controller on the NAS or possible memory compatibility/stability issues after your RAM upgrade.
Given the errors persist even after replacing the WD Red drive with a new one of the same model, and now the new drive also faults during resilvering, this points toward a potential hardware issue outside the drives themselves.
Your plan to swap the drives to opposite SATA bays is a good next step. If the errors follow the drive, it’s likely a drive problem; if they stay with the bay, it could be the SATA controller or cabling.
Since you upgraded RAM from 8GB to 16GB DDR5 4800, and ZFS is very sensitive to memory issues, reverting temporarily to the original 8GB RAM is also smart. Faulty or incompatible RAM can cause silent data corruption or I/O errors under heavy loads like resilvering.
Other things to check or try:
Ensure the SATA cables and connectors are firmly seated and of good quality.
Check the UGREEN firmware/BIOS for updates that might fix storage stability issues.
Test the drives on another system to confirm they’re healthy.
Look into your power supply—unstable or insufficient power can cause write errors during heavy disk operations.
Review the kernel and ZFS logs carefully for any additional clues.
Try running some SMART self-tests on the drives to confirm drive health.
Since you disabled the onboard eMMC and watchdog, ensure that these changes aren’t impacting stability unexpectedly.
Overall, my guess is either a faulty SATA port/controller on the NAS or possible memory compatibility/stability issues after your RAM upgrade.