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For CAL — compute arbitrage verdict

One page. Three things to read before the next compute arbitrage meeting.

Verdict in one sentence

Keep storage on Wasabi eu-central-1 and rent compute by use-case from OVH (CPU) or Nebius (GPU). All-in providers cost more and lock the data — S3NS is defended only on the hackathon angle.

Three axes

AxisStatusDecision
StorageWasabi 5.7 TiB, €380/yr, free egress under quotastay
Computerented per-UC, no migrationmixed
PipelinesDatabento ingested ; S&P streamingcontinue

Top-2 architectures per use case

UC = use case (5 use cases indexed on the Wasabi corpus). Costs are compute + egress, annual, excluding storage.

Use caseFirst choiceSecond choice
UC-01 — student lab Databento ITCH (50 CPU-h/yr)M2 Wasabi+OVH (~€10)M5 Wasabi+Colab (€0, preemptive)
UC-02 — student lab S&P \(\times\) RavenPack (100 CPU-h/yr)M2 Wasabi+OVH (~€20)M3 Wasabi+Scaleway (~€32)
UC-03 — backtest 1y cross-asset (240 CPU-h/yr)M2 Wasabi+OVH (~€50)M1 Wasabi+Nebius (~€100)
UC-04 — GPU sentiment fine-tune (240 GPU-h/yr)M1 Wasabi+Nebius H100 (~€700)M2 Wasabi+OVH H100 (~€600 if quote \(\leq\) €2.80/h)
UC-05 — agentic hackathon (130 CPU-h/yr + tokens)A4 S3NS all-in (partnership signal)M5 Wasabi+Colab (€0)

Detail per cell — friction, lock-in, sovereignty — scenario matrix §4.

Three atomic open questions

Each question is one decision. Reply 1 / 2 / 3 — no compound answers.

  1. Is SecNumCloud sovereignty a pedagogical deliverable of the Master?

    1. yes — A4 (S3NS all-in) re-enters UC-01 to UC-04 under a competitive quote.
    2. no — A4 stays parked on UC-05 only.
    3. defer — we keep the mixed default and re-open after a written brief.

  2. Is the S3NS hackathon (UC-05) activated as a programme deliverable?

    1. yes — we open an ephemeral S3NS bucket for UC-05 only ; the rest of the corpus stays on Wasabi.
    2. no — UC-05 runs on Colab + Wasabi (M5).
    3. defer — we hold the S3NS slot until June.

  3. Which compute provider for UC-01 to UC-04 by default?

    1. OVH (M2) — cheapest, FR-sovereign.
    2. Nebius (M1) — best for GPU, EU-sovereign (FI).
    3. Scaleway (M3) — FR alternative if academic credit is negotiated.

Hidden cost reminder

Migrating 5.7 TiB from Wasabi to any all-in provider is 0 € in egress fees but 9–18 days of continuous transfer on commercial bandwidth (measured 25–47 Mbps), plus checksum-reconciliation work on buckets without vendor MD5, plus the loss of Wasabi's zero-egress regime on future flows. Not a non-event.

Sources