> ## Documentation Index
> Fetch the complete documentation index at: https://dpos.xdr.ooo/llms.txt
> Use this file to discover all available pages before exploring further.

# Preparation Modes

> Choose Full OS Upgrade + Phase 2 or Phase 2 Only from the current DP state.

# Preparation Modes

The Mirror Manager supports two operator-facing preparation modes.

## Full OS Upgrade + Phase 2

Use this when the DP is still on Ubuntu 16.04 and must reach Ubuntu 24.04 before the final DP bringup.

The OS path is:

```text theme={null}
16.04 Xenial
  → 18.04 Bionic
  → 20.04 Focal
  → 22.04 Jammy
  → 24.04 Noble
```

After Noble is reached, Phase 2 brings the DP to **6.6.0**.

In this mode the Mirror Server prepares both:

* the selective Ubuntu OS Core tree from Cloudflare R2
* the DP 6.6.0 Phase 2 bundle from ACPS

## Phase 2 Only

Use this for supported DPs that are already on Ubuntu 24.04 but still require DP 6.6.0 bringup.

This mode skips R2 and OS-hop mirror preparation and prepares only the Phase 2 artifacts.

## Decision table

| Starting state                           | Mode                      | Final state             |
| ---------------------------------------- | ------------------------- | ----------------------- |
| DP 6.2.x / 6.3.x / 6.4.x on Ubuntu 16.04 | Full OS Upgrade + Phase 2 | Ubuntu 24.04 + DP 6.6.0 |
| DP 6.5.0 on Ubuntu 16.04                 | Full OS Upgrade + Phase 2 | Ubuntu 24.04 + DP 6.6.0 |
| Supported DP 6.2–6.5 on Ubuntu 24.04     | Phase 2 Only              | DP 6.6.0                |
| Healthy DP 6.6.0 on Ubuntu 24.04         | Normally no upgrade       | No change               |

The Phase 2 target is fixed at **6.6.0** in the current application. Do not use the older 6.5.0 bringup instructions from historical runbooks for the active Mirror Manager workflow.