On 2020年6月29日 7:37:45 JST, Hendrik Boom <hendrik@???> wrote:
>Where is it configured which drives get updated when I update the
>kernel,
>as part of a regular upgrade using aptitude.
>
>Presumably it has to install the new kernel, build an initrd, find out
>what other bootable systems are available, write a new grub
>configuration, and possibly update the MBR and stage1 of Grub ...
>
>Now somewhere there must be a configuration which hard drives' MBRs and
>
>stage1's have to be written.
>
>I think my machine is configured to write this to multiple drives. (I
>vaguely remember configuring this long ago during an installation or
>maybe an upgrade from debian to Devuan)
>In any case it tries to write to /dev/sdb and has trouble doing so.
>(hardware problem; I plan to remove this disk once I find a
>screwdriver)
>/dev/sda, /dev/sdc, and /dev/sdd are also available.
>
>Where is this configuration located?
>How can I change this configuration?
>
>-- hendrik
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>Dng@???
>https://mailinglists.dyne.org/cgi-bin/mailman/listinfo/dng

Hi,

are you using md and mdam?

If YES, then below command
might help you to find where you
installed kernel and grub

mdadm --details /dev/md0

#disclaimer:
this is just an effect of mdadm
command output.

There are better ways, I do not know,
I think.

HTH