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Troubleshooting
===============
- If re-installed, there is some leftovers from LVM/Device Mapper causing CentOS installer
to crash (even if 'clearpart' is specified). After first crash, it may be useful.
* Clean partition tables with
dd if=/dev/zero of=/dev/<device> bs=512 count=1024
* Destroy rogue LVM VGs
vgdestroy <vgname>
* Destroy rogue device mapper devices
dmsetup info -C
dmsetup remove_all
dmsetup remove <name>
- Sometimes even this does not help.
> On CentOS 7.4 mdadm does not recognize the disk, but LVM thinks it is
part of MD. Then cleaning last megabytes of the former md partition may help.
> On Fedora 28, mdadm detects the old array and tries to "tear down" it down, but
fails as raid array is already innactive.
* If raid is still more-or-less healthy. It can be destroyed with
mdadm --zero-superblock /dev/sdb3
* Otherwise:
dd if=/dev/zero of=/dev/sda4 bs=512 seek=$(( $(blockdev --getsz /dev/sda4) - 1024 )) count=1024
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