MD devices are not wiped if LVM exists

[Thomas Lange]

>>>>> On Mon, 1 Jul 2019 14:40:51 +0100, Jerry Steele <ticktockhouse at gmail.com> said:

    > If FAI is run against this machine again after its 1st install, I get the following error:

    > (STDERR) mdadm: Cannot get exclusive access to /dev/md1:Perhaps a running process, mounted filesystem or active volume group?
    > Command had non-zero exit code

    > It's enough to do:

    > # vgremove -y  vg_system

    > ...which removes the LVM metadata and on the next install, FAI is able to partition the disks as needed. Is there a way to run this command before the disk_config stuff is run? Obviously the
    > custom scripts are run well after this point. Or is there something built into FAI to completely wipe LVM data before attempting to wipe the MD devices?
You can write a simple hook, which is then executed before
task_partition. Therefore, create a shell script hooks/partition.DEFAULT

-- 
regards Thomas