"unused disk" problems with rc4 et rc6

[TKinslayer]

All of my Terraform scripts used to work but... they don't seem to anymore. I actually see where the problem is but not how to fix it...

Here is the problem:

• I have a cloud-init template that has its cloudinit drive in ide0, and an iscsi0 as a disk-0 for the VM disk.
• In my Terraform script (as shown below), I clone the VM and I set an ide0 drive for the cloudinit, and an iscsi0 with a disk0 for the VM disk
• Used to work... but now, it when the script changes the size of the disks (from 10g to 8g), it also changes the disk-0 of iscsi0 and set it to disk-1 (creating a new disk)
• And in the Proxmox VM's hardware, it says that there is a disk 0 that is unused...
• And when the VM tries boots it says the disk is unbootable.

1. Cloudinit hardware

2. VM's hardware BEFORE it tries to resize the disk, with a disk0 for the SCSI drive

3. VM's hardware AFTER it resizes and create a new disk and put the former one in unused

4. Error message when the VM tries to boot

And I know the problem is that disk0 to disk1. Because when I manually (through the GUI) detach disk1 and add disk0 inside the VM, it works !!!!

But... I don't want to manually do that to all VMs...

I am on Proxmox 8.2.7 and used both "3.0.1-rc4" and "3.0.1-rc6"

Here are the two Terraform scripts I used for the "3.0.1-rc4" :

resource "proxmox_vm_qemu" "test" {
    target_node = "pve${count.index + 1}"
    vmid = "102${count.index + 1}"
    name = "HA-${count.index + 1}"
    tags = "high_availibility,maximal_protection"

    count = 3
    onboot = true
    vm_state = "started"
    
    clone = "Cloud-init-Generic"
    full_clone  = true

    agent = 1

    os_type = "cloud-init"
    cores = 2
    sockets = 1
    numa = false
    vcpus = 0
    cpu = "host"
    memory = 4096

    kvm = true 
    serial {
        id = 0
        type = "socket"
    }

    scsihw   = "virtio-scsi-pci"
    bootdisk = "scsi0"

    disks {
        ide {
            ide0 {
                cloudinit {
                    storage = "Local_ZFS"
                }
            }
        }
        scsi {
            scsi0 {
                disk {
                    size = "8192M"
                    storage = "Local_ZFS"
                    emulatessd = true 
                }
            }
        }
    }
    network {
        model = "virtio"
        bridge = "vmbr3"
        tag = 40
    }

    ipconfig0 = "ip=10.66.40.${13 + count.index}/24,gw=10.66.40.1"

    timeouts {
        create = "2h"
        update = "2h"
        delete = "1h"
    }
    agent_timeout = 1200

    ciupgrade = true

    nameserver = "10.66.1.1"

    sshkeys = <<EOF
        XXXX-keys
    EOF
}

Here are the two Terraform scripts I used for the "3.0.1-rc6" :

resource "proxmox_vm_qemu" "test" {
  name         = "HA-Test"
  target_node  = "pve1"
  vmid         = 1021
  clone        = "Cloud-init-Generic"
  full_clone   = true
  agent        = 1
  os_type      = "cloud-init"
  cores        = 2
  sockets      = 1
  memory       = 8192
  scsihw       = "virtio-scsi-pci"
  bootdisk     = "scsi0" 
  onboot       = true
  vm_state     = "started"
  hastate      = "enabled"

  disk {
    type    = "cloudinit"
    storage = "Local_ZFS"
    slot    = "ide0"
  }

  disk {
    type      = "disk"
    storage   = "Local_ZFS"
    size      = "8G"
    emulatessd = true
    slot      = "scsi0"
  }

  network {
    id     = 0
    model  = "virtio"
    bridge = "vmbr3"
    tag    = 40
  }

  ipconfig0 = "ip=10.66.40.250/24,gw=10.66.40.1"
  nameserver = "10.66.1.1"
  sshkeys = <<EOF
       XXXX-keys
    EOF

  timeouts {
    create = "2h"
    update = "2h"
    delete = "1h"
  }
  agent_timeout = 1200
  ciupgrade = true
}

With rc6, I had some problems with the disk id, it told me I couldn't put them to 0, and had to let them be dynamically set, so I had to remove them.

What could be wrong ?

[Tinyblargon]

@TKinslayer It's not possible to resize a disk to be smaller, making a disk smaller recreates the disk.
Setting scsi0 to be 10G at minimum would prevent this recreation.

[TKinslayer]

Ahhhh...
Kinda looks totally logical in fact, now that I think about it.
I feel dumb now.... ;-(

@Tinyblargon - Thanks a bunch for your quick answer !