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-rw-r--r--docs/kickstart.txt12
1 files changed, 11 insertions, 1 deletions
diff --git a/docs/kickstart.txt b/docs/kickstart.txt
index 1331542..b94b0f6 100644
--- a/docs/kickstart.txt
+++ b/docs/kickstart.txt
@@ -11,4 +11,14 @@ Troubleshooting
dmsetup remove_all
dmsetup remove <name>
- \ No newline at end of file
+ - 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
+