fix(nvca): provision the shared filesystem cache writer on the model cache class - #1564
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fix(nvca): provision the shared filesystem cache writer on the model cache class#1564balajinvda wants to merge 4 commits into
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…cache class The shared filesystem path created its writer claim on nvcf-miniservice-sc, the class whose presence selects that path. Every other backend provisions on the model cache class, nvcf-sc or the configured override, and the persisted selection that now drives Helm backend selection records that class as well. On a cluster that has a shared filesystem behind nvcf-sc but no nvcf-miniservice-sc, the selection picked this path and the writer claim then waited for a class that did not exist. The writer now takes the model cache class through the same helper the NVMesh and Samba paths use. nvcf-miniservice-sc keeps one job: its presence tells legacy selection that an operator provided a shared filesystem. Co-Authored-By: Balaji Ganesan <bganesan@nvidia.com>
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Included review availability: Your plan provides up to 12 included reviews per hour; 10 remain after this review. 📝 WalkthroughWalkthroughThe shared-filesystem backend now treats the shared StorageClass as a detection signal. Model cache writer PVCs and Samba backing volumes use the configured model cache StorageClass. Tests and documentation describe static reader PVs bound to the writer volume. ChangesShared-FS model cache
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: ⚪ Minimal · up to The change routes shared-filesystem model-cache writer storage to the configured model cache StorageClass, with no remaining identified merge-blocking risk. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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Full details: Docstring CoverageExplanation Docstring coverage is 75.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 4 functions across 3 files. (1 skipped: 1 unsupported.)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In `@docs/user/cluster-management/model-cache.md`:
- Line 197: Update the shared-filesystem reader description in the model-cache
documentation to state that it is a static PV bound to the writer’s volume
without a StorageClass. Clarify that the model-cache StorageClass applies only
to the writer PVC.
- Around line 71-74: Update the Samba backing-volume description to reference
the configured model-cache StorageClass, including any override instead of
always naming nvcf-sc. Keep the surrounding explanation of NVCA and the derived
readers unchanged.
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docs/user/cluster-management/model-cache.mdsrc/compute-plane-services/nvca/pkg/storage/cachebackend.gosrc/compute-plane-services/nvca/pkg/storage/modelcache.gosrc/compute-plane-services/nvca/pkg/storage/modelcache_test.go
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… class override The existing test only asserted the default class, which the old hard-coded value could never produce but which a default could satisfy by accident. A second envtest configures a class override and asserts the writer claim carries it; with the old code no configuration reaches the writer, so the assertion cannot pass. The manager bootstrap and request setup move into helpers shared by both tests. Co-Authored-By: Balaji Ganesan <bganesan@nvidia.com>
…d filesystem test helpers The previous commit moved setup into helpers but the existing test still used the ICMSRequest, StorageRequest, and cancel func they created, so the package did not compile. The helpers now return them. Co-Authored-By: Balaji Ganesan <bganesan@nvidia.com>
The reader PV carries no StorageClass, so a pre-bound pair matches; only the writer claim uses the model cache class. The Samba backing volume uses the configured model cache class, not always nvcf-sc. Co-Authored-By: Balaji Ganesan <bganesan@nvidia.com>
This was referenced Sep 4, 2026
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Why
The shared filesystem cache path created its writer claim on
nvcf-miniservice-sc, the StorageClass whose presence selects that path. Every other backend provisions on the model cache class (nvcf-sc, or the configured override), and the persisted selection that now drives Helm backend selection (#1334) records that class too. On a cluster with a shared filesystem behindnvcf-scand nonvcf-miniservice-sc, selection picked this path and the writer claim then waited forever for a class that did not exist. Enabling Weka or OCI FSS in the catalog would have hit this immediately.What changed
The shared filesystem writer claim takes the model cache class through
applyModelCacheStorageClass, the same helper the NVMesh and Samba paths use.nvcf-miniservice-sckeeps exactly one role: its presence tells legacy selection that an operator provided a shared filesystem. It no longer holds any cache data.The user doc's backend table and the reader description are updated to match; the reader has been a static PV on the writer's volume since #1434.
Customer Release Notes
Fixed shared filesystem model caching on clusters whose model cache StorageClass is a shared filesystem but which have no
nvcf-miniservice-scStorageClass.Plan Summary
Not applicable.
Usage
No operator action. Clusters that already provide
nvcf-miniservice-sccontinue to select the shared filesystem path; new cache volumes land on the model cache class.Testing
TestReconcile_ModelCacheSharedFSnow asserts the writer claim uses the model cache class and fails against the old code.go test ./pkg/storage/...andgolangci-lintclean.QA: one run on a shared filesystem cluster confirming the writer PVC binds on
nvcf-sc.Notes
Last prerequisite for enabling a shared filesystem backend in the catalog: selection (#1334), derived readers (#1434), NVMesh by provisioner (#1516), and now the writer class all resolve through
nvcf-sc.References
None.
Related Pull Requests
Dependencies
None.
Issues
Relates to #1326
Summary by CodeRabbit
Bug Fixes
Documentation