Zpool read errors, what could be the problem?

Question

ZFS

Hello!
Available: Ubuntu 18.04 LTS, 2 ZFS pools, non-ECC 8 GB RAM.

When moving a large number of small files from one pool to another via samba via windows explorer, the following information was found in the zpool status:

spoiler

zpool status
pool: files
state: DEGRADED
status: One or more devices has experienced an unrecoverable error. An
attempt was made to correct the error. Applications are unaffected.
action: Determine if the device needs to be replaced, and clear the errors
using 'zpool clear' or replace the device with 'zpool replace'.
see: zfsonlinux.org/msg/ZFS-8000-9P
config:

NAME STATE READ WRITE CKSUM
files DEGRADED 0 0 0
ata-WDC_WD1003FBYX-01Y7B1..... DEGRADED 95 0 179 too many errors

I immediately looked smart - everything is clean, there are no errors, there are no bad and reassigned sectors.
I ran zpool scrub, the result is:
scan: scrub repaired 0B in 2h3m with 0 errors on Sun Oct 11 08:21:18

2020 after checking, it turned out that the files are all so whole. But what could be the problem that some reading errors and checksum errors were found?
Is there a possibility that the cause was a software glitch related to samba, or a bug in the RAM?

Answer 1

Change the SATA cable just in case.