> On Nov 2, 2026, at 10:31 AM, Steve Fairhead <[email protected]> wrote:
>
>
>> On 02/11/2026 13:20, [email protected] wrote:
>> The physical dd read test is pretty slick...
>> # dd if=/dev/rsdXc of=/dev/null bs=1m
>> (where "X" is your physical device you are checking).
>> If it returns with a zero return code, your entire disk surface was read
>> successfully. If it fails, you got problems. I'd recommend doing this on
>> all important disks in your environment. In OpenBSD, this seems to be
>> non-destructive and can be run while file systems are mounted and active.
>
> I tried that on one of my systems:
>
> # dd if=/dev/wd1d of=/dev/null bs=1m
The “r” before wd1d. /dev/rwd1d
> dd: /dev/wd1d: Device busy
>
> What am I missing?
>
> Steve
>
>
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