Ansible- add disk to vm skipping SCSI ID (x:7)

As the virtual SCSI adapter requires a SCSI ID and No 7 is reserved for it, let’s try to handle it writing Ansible’s task.

We will use ‘vmware_guest_disk‘ module to add disk to vm. Because two disk parameters are required: ‘scsi_controler’ and ‘unit_number’, we will try to use Jinja2 filter ‘|int + 1’ to add next available SCSI device Unit Number.

1. First we need to use ‘vmware_guest_disk_facts‘ module to gather disk facts from our vm where we want to add new vdisk:

- name: Gather disk facts from "{{vmName}}"
  vmware_guest_disk_facts:
    hostname: "{{ vCenterHostname }}" 
    username: "{{ vCenterUsername }}"
    password: "{{ vCenterPassword }}"
    validate_certs: false
    datacenter: "{{ vCenterDatacenter }}" 
    name: "{{ vmName }}"
  delegate_to: localhost
  register: diskOutput

2. Task to list currently used SCSI Controller Bus Number (controller_key):

- name: set fact - controllerFacts
  set_fact: 
    controllerFacts: "{{ diskOutput.guest_disk_facts.values()| map(attribute='controller_key') | list  }}" 

3. Next step is to sort ‘controller_key‘ by last number in use.

- name: set facts - controllerKey
  set_fact: 
    controllerKey: "{{ controllerFacts | sort | last  }}"

4. Set fact for SCSI device Unit Number (unitNumber) – pay attention at ‘int + 1’ at the end of 3rd line:

- name: set fact - unitNumber
  set_fact:
    unitNumber: "{{ diskOutput.guest_disk_facts.values() |selectattr('controller_key','equalto',(controllerKey | int))|map(attribute='unit_number')| list | sort | last |int +1 }}"

5. And the most important step – skipping controller SCSI ID No 7. Otherwise you will get an error when add vdisk No 8.

- name: Skip SCSI controller No 7
  set_fact:
    unitNumber: "{{unitNumber |int+1 }}"
  when: unitNumber == "7"

6. So when we have a ‘controllerKey‘ and ‘unitNumber‘ defined we can just use both in ‘vmware_guest_disk‘ module to add new disk to our vm:

- name: Add disk to virtual machine
  vmware_guest_disk:
    hostname: "{{ vCenterHostname }}" 
    username: "{{ vCenterUsername }}"
    password: "{{ vCenterPassword }}"
    validate_certs: false
    datacenter: "{{ vCenterDatacenter }}"
    name: "{{vmName}}"
    disk:
      - size_gb: '{{sizeGb}}'
        type: '{{diskType}}'
        state: present
        datastore: "{{  datastoreName }}"
        scsi_type: '{{scsiType}}'
        scsi_controller: "{{controllerKey[3:4]}}"
        unit_number: "{{unitNumber}}"
  delegate_to: localhost
  register: diskFacts

And that’s it.

Next part will cover creation of Windows partition on disk.

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