The only command that I know of that can delete a partition mapping
like this is partx. On mine partx is not in the initrd so it should
not be happening there.
So:
cd /usr/sbin
mv partx partx.exe
then create a file:
#!/bin/bash
logger "$(/usr/bin/date) kartx run with options $*"
/usr/sbin/partx.exe $*
Test with running "partx --help" and make sure a message shows up in
messages file from the logger command.
If that finds something doing the delete then add a "ps -elf >
somefile" to the script before you execute partx.exe
I have had to use this trick a number of times to figure out what code
path was doing something odd.
You might also run "dmsetup table" and see what is referencing device
8:X (sda is :0, sda1: 1 and so on).
On Thu, Mar 4, 2021 at 5:16 AM GianPiero Puccioni
<gianpiero.puccioni@xxxxxxxxxx> wrote:
>
> On 3/3/21 11:50 PM, Roger Heflin wrote:
> > the dm-multipath should be ok, so long as multipathd is not there.
> >
> > grep -i del_part_nodes /lib/udev/rules.d/*
> >
> > shows the multipath delete rule. I am on 32 and don't see anything
> > else using it.
> >
> > if you cat the rule with the del_part_nodes code you could see if
> > anything else on 33 uses it.
> >
> >
> del_part_nodes appears only in /lib/udev/rules.d/68-del-part-nodes.rules
> which has at the start:
>
> # To suppress this, use the kernel parameter "dont_del_part_nodes",
> # or create an udev rule file that sets ENV{DONT_DEL_PART_NODES}="1".
>
> As I cannot change the kernel par, I added a (found online)
> /lib/udev/rules.d/00-dont-del-part-nodes.rules with
>
> SUBSYSTEM=="block", KERNEL=="sd*|dasd*|rbd*", ACTION=="add|change", \
> ENV{DONT_DEL_PART_NODES}="1"
>
> and rebooted but nothing changed.
>
> GiP
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