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+## GREP-270: Automatic MNNVL Support in Grove
+
+**GREP owner**: TBD  
+**Status**: Draft  
+**Tracking issue**: [Add automatic support for MNNVL](https://github.com/ai-dynamo/grove/issues/270)
+
+### Problem statement
+
+Grove today does not provide first-class support for NVIDIA Multi-Node NVLink (MNNVL). As a result, workloads running on systems like the NVIDIA GB200 NVL72 cannot automatically form secure, high-bandwidth GPU fabrics across nodes using NVIDIA ComputeDomains and Dynamic Resource Allocation (DRA).
+
+We need a way for a `PodCliqueSet` (PCS) workload to:
+
+- Express that it **requires a ComputeDomain** (i.e. wants to run with MNNVL).
+- Have Grove take care of:
+  - Creating and wiring **ComputeDomains**.
+  - Creating and wiring **ResourceClaimTemplates** (RCTs).
+  - Injecting **pod-level resource claims** and **container-level resource claim usage**.
+  - Cleaning up these resources when the workload terminates.
+
+### How ComputeDomains work
+
+A **ComputeDomain** is a NVIDIA abstraction that enables workloads to use MNNVL (Multi-Node NVLink) across one or more physical racks. Key aspects:
+
+- **One ComputeDomain per PCS replica**, regardless of how many MNNVL racks the pods are distributed across.
+- The ComputeDomain controller **automatically orchestrates IMEX domains** (one per physical rack).
+  - Pods on the same rack communicate via fast MNNVL/NVLink.
+  - Pods on different racks fall back to the fastest available inter-rack fabric (slower than NVLink).
+- **Auto-scaling support**: New pods joining a workload can automatically join existing IMEX domains on their respective racks (requires DRA driver 25.8.0+ and GPU driver 570.150.x+).
+
+**Bottom line**: One ComputeDomain per PCS replica, automatic multi-rack orchestration, with fast MNNVL communication within racks but not across them.
+
+### Goals and non-goals
+
+- **Goals**
+  - Allow a PCS to declare MNNVL usage declaratively in its spec.
+  - Support **per-replica ComputeDomains** so each PCS replica has its own isolated GPU fabric.
+  - Automatically manage the lifecycle of ComputeDomains and RCTs.
+  - Ensure pods are correctly wired via Kubernetes `resourceClaims` and container `resources.claims`.
+
+### User-facing API changes
+
+Add a `computeDomainConfig` section to `PodCliqueSet.spec.template`:
+
+- **`enabled`**: bool – turn MNNVL on/off for the PCS.
+- **`deviceClassName`**: string – device class for the RCT, default `compute-domain.nvidia.com`.
+
+In this design:
+- ComputeDomains are always **per-replica** (one ComputeDomain per PCS replica).
+- Users **do not define per-replica ComputeDomains explicitly** (names or instances); Grove derives and manages those resources from the PCS spec and replica indices.
+- The PCS API only captures **high-level intent** (enable MNNVL).
+
+#### Manual / non-automatic usage limitations
+
+If `computeDomainConfig.enabled` is **disabled**, users can still hand-craft `resourceClaims` and `resources.claims` in the PCS/PodClique templates, but only in a **replica-agnostic** way:
+
+- The PCS and PodClique specs do not carry the PCS replica index.
+- Therefore, users **cannot express true per-replica ComputeDomains manually** (for example, "replica-0 uses CD-0, replica-1 uses CD-1") just by editing the PCS.
+- Per-replica ComputeDomains are only available through Grove's automatic wiring, which has access to the replica index at reconciliation time.
+
+### Design: where to inject ResourceClaims
+
+Given that ComputeDomains are **per-replica** and Grove's current webhook architecture (PCS has webhooks, but PodClique does not), the injection must happen in the **PCS controller's PodClique component**.
+
+#### Why PCS-level injection is NOT viable
+
+The PCS template is **replica-agnostic**:
+- The PCS defaulting webhook runs once when the PCS is created/updated and operates on `PodCliqueSet.spec.template`.
+- The template is shared across **all replicas**.
+- Kubernetes PodSpec has no templating/variable system to express "use `<pcs-name>-{replicaIndex}-mnnvl-claim`".
+- If the webhook injects a ResourceClaimTemplate name, all replicas would reference the **same** RCT, defeating the per-replica isolation goal.
+
+Therefore, **per-replica ResourceClaim injection cannot happen at the PCS admission webhook level**.
+
+#### Recommended approach: PodClique controller injection
+
+**How it works:**
+1. **PCS admission webhook**:
+   - Validates `computeDomainConfig` fields (e.g., GPU requests present, no conflicting user-defined ResourceClaims).
+   - Defaults `deviceClassName` to `compute-domain.nvidia.com`.
+   - **Does NOT inject ResourceClaims** (cannot solve per-replica problem).
+
+2. **PCS controller's PodClique component** (`buildResource` function in `internal/controller/podcliqueset/components/podclique/podclique.go`):
+   - When building each PodClique for a `(PCS replica index, clique)` pair:
+     - Check if `pcs.spec.template.computeDomainConfig.enabled=true`.
+     - If enabled:
+       - Compute per-replica ComputeDomain and ResourceClaimTemplate names from `pcs.name + replicaIndex`.
+       - Inject `resourceClaims` entry into `PodClique.spec.PodSpec` referencing the per-replica RCT.
+       - Inject `resources.claims` entries into each container that should use the ComputeDomain (e.g., containers with GPU requests).
+
+3. **ComputeDomain/RCT lifecycle controllers** (new PCS components):
+   - Ensure one ComputeDomain and one ResourceClaimTemplate exist per PCS replica.
+   - Delete them on scale-down or PCS deletion.
+
+4. **Pod creation**:
+   - The PodClique controller's Pod component simply copies `PodClique.spec.PodSpec` to `Pod.spec`.
+   - Pods inherit the per-replica ResourceClaim wiring from their parent PodClique.
+
+**Pros:**
+- ✅ **Natural fit for per-replica semantics**: The PodClique controller already knows the replica index.
+- ✅ **Clean mapping**: `PCS replica index → PodClique → ComputeDomain/RCT` is straightforward.
+- ✅ **No placeholder/pattern resolution**: The correct per-replica RCT name is computed and injected directly.
+- ✅ **No new webhooks needed**: Uses existing PCS controller infrastructure.
+- ✅ **PodClique spec is the single source of truth**: Pods mirror their PodClique's PodSpec; no hidden mutations.
+- ✅ **Consistent with existing patterns**: The PCS controller's PodClique component already injects labels, dependencies, and environment variables.
+
+**Cons:**
+- ❌ **Less transparent at PCS level**: MNNVL wiring is not visible in the PCS spec; users must inspect PodClique objects to see the actual ResourceClaim configuration.
+- ❌ **Validation is partial at admission time**: The webhook can validate high-level intent, but cannot validate the final per-replica wiring until PodCliques are created.
+
+**Trade-off rationale:**
+- Per-replica semantics fundamentally cannot be expressed at the PCS template level (it's replica-agnostic by design).
+- Users can still see that MNNVL is enabled at the PCS level (`computeDomainConfig.enabled=true`).
+- PodClique objects are inspectable and show the actual per-replica wiring.
+- This is consistent with how Grove already handles per-replica concerns (e.g., replica-specific labels, startup dependencies).
+
+#### Alternative: Create a new PodClique defaulting webhook
+
+Another viable approach would be to **create a new PodClique defaulting webhook** (which doesn't exist in Grove today) that injects ResourceClaims when a PodClique is created.
+
+**How it would work:**
+1. When a PodClique is created, the webhook intercepts it.
+2. The webhook:
+   - Fetches the parent PCS to check `computeDomainConfig.enabled`.
+   - Extracts the replica index from PodClique labels (e.g., `grove.io/pcs-replica-index`).
+   - Computes the per-replica ComputeDomain/RCT names.
+   - Injects `resourceClaims` and container `resources.claims` into `PodClique.spec.PodSpec`.
+
+**Pros:**
+- ✅ Keeps injection in the admission layer (consistent with separation of concerns: webhooks mutate, controllers reconcile).
+- ✅ PodClique spec shows final wiring before it reaches any controller.
+
+**Cons:**
+- ❌ **Requires new infrastructure**: Creating a new webhook requires chart updates, webhook configuration, and testing.
+- ❌ **Extra API calls**: Webhook must fetch the parent PCS (adds latency, potential for race conditions during PCS create/update).
+- ❌ **More complex error handling**: Webhook runs at admission time; if parent PCS is not found or misconfigured, the PodClique creation fails, which is harder to debug than controller errors.
+- ❌ **Still not transparent at PCS level**: Like the PodClique controller approach, users must inspect PodClique objects to see MNNVL wiring.
+
+**Recommendation:** Stick with **PodClique controller injection** because:
+- It's simpler (no new webhook infrastructure).
+- The PodClique controller already has the parent PCS object in hand; no need to fetch it.
+- Controller errors are easier to observe and debug (via events, status, logs) than webhook errors.
+- Grove today has no PodClique webhooks, so adding one would be a significant architectural change just for this feature.
+
+### ComputeDomain & ResourceClaimTemplate lifecycle
+
+- Grove, given a PCS with `computeDomainConfig.enabled=true`, ensures one ComputeDomain and one ResourceClaimTemplate per PCS replica.
+- For each PCS replica index:
+  - Create a **ComputeDomain** with:
+    - Name derived from PCS name + replica index (e.g. `<pcs-name>-<replica-index>-cd`).
+    - `numNodes: 0` (elastic).
+  - Create a **ResourceClaimTemplate** with:
+    - Name derived from PCS name + replica index (e.g. `<pcs-name>-<replica-index>-mnnvl-claim`).
+    - CEL selector matching the ComputeDomain name.
+- These resources are owned by the PCS and are deleted when:
+  - A replica is scaled down, or
+  - The PCS is deleted.
+
+### Implementation summary
+
+The MNNVL feature will be implemented across three layers:
+
+1. **PCS API** (`operator/api/core/v1alpha1/podcliqueset.go`):
+   - Add `computeDomainConfig` struct to `PodCliqueSetTemplateSpec`.
+   - Fields: `enabled` (bool), `deviceClassName` (string).
+
+2. **PCS admission webhook** (`operator/internal/webhook/admission/pcs/`):
+   - **Defaulting**: Set `deviceClassName` to `compute-domain.nvidia.com` when `enabled=true`.
+   - **Validation**: Ensure GPU requests are present in containers, no conflicting user-defined ResourceClaims with the internal claim name (`mnnvl`).
+
+3. **PCS controller's PodClique component** (`operator/internal/controller/podcliqueset/components/podclique/podclique.go`):
+   - In `buildResource`: Check if `computeDomainConfig.enabled=true`.
+   - Compute per-replica CD/RCT names: `<pcs-name>-<replica-index>-cd` and `<pcs-name>-<replica-index>-mnnvl-claim`.
+   - Inject `PodClique.spec.PodSpec.resourceClaims` and container `resources.claims`.
+
+4. **New PCS components** (in `operator/internal/controller/podcliqueset/components/`):
+   - **ComputeDomain operator**: Create/update/delete ComputeDomain objects per PCS replica.
+   - **ResourceClaimTemplate operator**: Create/update/delete RCT objects per PCS replica with CEL selectors.
+   - Register these in the PCS controller's operator registry.
+
+5. **RBAC updates** (`operator/charts/templates/clusterrole.yaml`):
+   - Add permissions for `resource.nvidia.com/v1alpha1/computedomains` (CRUD).
+   - Add permissions for `resource.k8s.io/v1beta1/resourceclaimtemplates` (CRUD).
+
+### Open questions for discussion
+
+- What is the desired failure behavior if the NVIDIA stack (ComputeDomain CRD/DRA) is not installed or misconfigured?
+- Should we add a status field to PCS to surface per-replica ComputeDomain readiness, or rely on users inspecting ComputeDomain objects directly?
+
+