ceph: add script to delete/clean disk

ceph/ceph-delete-disk

@@ -0,0 +1,32 @@
+#!/usr/bin/env bash
+# Inspired from https://rook.io/docs/rook/v1.7/ceph-teardown.html
+
+if [ $# -ne 1 ]; then
+    echo $0 disk
+    echo f.i. $0 /dev/sdx
+    exit 1
+fi
+
+DISK="$1"; shift
+
+# Zap the disk to a fresh, usable state (zap-all is important, b/c MBR has to be clean)
+
+# You will have to run this step for all disks.
+sgdisk --zap-all $DISK
+
+# Clean hdds with dd
+dd if=/dev/zero of="$DISK" bs=1M count=100 oflag=direct,dsync
+
+# Clean disks such as ssd with blkdiscard instead of dd
+blkdiscard $DISK
+
+# These steps only have to be run once on each node
+# If rook sets up osds using ceph-volume, teardown leaves some devices mapped that lock the disks.
+ls /dev/mapper/ceph-* | xargs -I% -- dmsetup remove %
+
+# ceph-volume setup can leave ceph-<UUID> directories in /dev and /dev/mapper (unnecessary clutter)
+rm -rf /dev/ceph-*
+rm -rf /dev/mapper/ceph--*
+
+# Inform the OS of partition table changes
+partprobe $DISK