39 lines
1.7 KiB
YAML
39 lines
1.7 KiB
YAML
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# Dedicated StorageClass for model weights on worker-1's local NVMe.
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#
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# Why not the default `longhorn` class (3 replicas, network-attached):
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#
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# 1. numberOfReplicas: 1 — model weights are re-downloadable from HuggingFace.
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# Replicating them 3x buys nothing; losing a replica costs a re-pull, not
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# data. The repo's "never delete a PVC without replicas/backups" rule exists
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# for irreplaceable data, which this is not.
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#
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# 2. dataLocality: strict-local — keeps the single replica on the SAME node as
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# the pod. All engines are pinned to worker-1, so weights are read from its
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# local 751GB NVMe instead of over the network from a control-plane node.
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# Removes ~60GB of network reads on every cold start.
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#
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# 3. diskSelector: llm — restricts this class to disks tagged `llm`, i.e. only
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# worker-1's disk. Equally important, worker-1's disk carries that tag so
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# UNTAGGED volumes (any ordinary cluster PVC) will not land on it. Before
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# tagging, worker-1 had been silently hosting a replica of cicd/runner-dind,
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# consuming GPU-node storage for general cluster workloads.
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#
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# The default 3-replica class also physically could not place this volume: all
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# three control-plane disks were already at their over-provisioning ceiling
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# (storage-over-provisioning-percentage=100, 30% reserved), so a 120Gi x3
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# request failed with ReplicaSchedulingFailure on every node.
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apiVersion: storage.k8s.io/v1
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kind: StorageClass
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metadata:
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name: longhorn-llm-local
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provisioner: driver.longhorn.io
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allowVolumeExpansion: true
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reclaimPolicy: Delete
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volumeBindingMode: Immediate
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parameters:
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numberOfReplicas: "1"
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dataLocality: "strict-local"
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diskSelector: "llm"
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staleReplicaTimeout: "30"
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fsType: "ext4"
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