initial reboot and find disk by size

oracle19c_rdbmsinstall.yml

@@ -2,12 +2,29 @@
   hosts: dbservers
   become: yes
   vars:
-    cdm_ip: 192.168.10.18
+    cdm_ip: 192.168.10.22
     packages:
       - oracle-database-preinstall-19c
       - https://{{ cdm_ip }}/connector/rubrik-agent.x86_64.rpm
 
   pre_tasks:
+    - name: Check if reboot marker file exists
+      stat:
+        path: /var/tmp/reboot_marker
+      register: reboot_marker
+
+    - name: Perform initial reboot
+      reboot:
+        msg: "Rebooting the system before starting the installation process to obtain DHCP hostname"
+        reboot_timeout: 300
+      when: not reboot_marker.stat.exists
+
+    - name: Create reboot marker file
+      file:
+        path: /var/tmp/reboot_marker
+        state: touch
+      when: not reboot_marker.stat.exists
+
     - name: Update all packages
       dnf:
         name: "*"
@@ -20,19 +37,32 @@
         disable_gpg_check: true
         state: present
 
-    - name: Create LVM partition on /dev/sdb
+    - name: Get block devices
+      ansible.builtin.setup:
+        gather_subset:
+          - hardware
+
+    - name: Find the disk by size
+      set_fact:
+        target_disk: "{{ item.key }}"
+      with_dict: "{{ ansible_devices }}"
+      when:
+        - item.key is match('^sd.*$')  # only sda, sdb, etc.
+        - item.value.size == '100.00 GB'
+
+    - name: Create LVM partition on /dev/{{ target_disk }}
       parted:
-        device: /dev/sdb
+        device: /dev/{{ target_disk }}
         number: 1
         state: present
         part_type: primary
         flags: [lvm]
         resize: yes
 
-    - name: Create VG on /dev/sdb1
+    - name: Create VG on /dev/{{ target_disk }}1
       lvg:
         vg: vg_oracle
-        pvs: /dev/sdb1
+        pvs: /dev/{{ target_disk }}1
 
     - name: Create LV for Oracle binaries
       lvol: