Hi Tim,

> $ sudo -i dd if=/dev/sdb  bs=128k of=/dev/null
>   3815520+1 records in
> 3815520+1 records out
> 500107862016 bytes (500 GB, 466 GiB) copied, 9005.03 s, 55.5 MB/s

So that's OK.

> I did grep the /var/log/ with both sdb and swap

Has your Linux switched to systemd's journalctl(1) yet?
Perhaps it's in there you should be looking.
Or dmesg(1) if it's a kernel issue.

Cheers, Ralph.

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