misc/scratch: move prod-like-arm to Graviton4 - #38739
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The `prod-like-arm` scratch config still launched an `r6g.4xlarge`. Production's ARM node pools have moved on: the pools that carry weight today are `arm-swap` and `arm-jumbo-swap`, both on the `r8gd` family. Staying on Graviton2 means the box under test no longer matches the microarchitecture production runs on. Move the family to `r8g` and keep the size at `4xlarge`, so the CPU generation tracks production while the footprint and cost of the box are unchanged. Production uses the `d` variant for its local NVMe, which backs swap and the scratch filesystem. This config stays on plain `r8g`: nothing in `misc/scratch/provision.bash` mounts an instance store, so the extra disk would go unused. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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marked this pull request as ready for review
September 9, 2026 23:23
jasonhernandez
enabled auto-merge (squash)
September 9, 2026 23:23
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The
prod-like-armscratch config still launched anr6g.4xlarge, a Graviton2 box. Production's ARM node pools have moved on: the pools carrying weight today (arm-swap,arm-jumbo-swap) are all on ther8gdfamily, so a "production-like" scratch box was no longer on the microarchitecture production actually runs.This moves the family to
r8gand keeps the size at4xlarge, so the CPU generation tracks production while the footprint and cost of the box are unchanged.Production uses the
dvariant for its local NVMe, which backs swap and the scratch filesystem. This config deliberately stays on plainr8g: nothing inmisc/scratch/provision.bashmounts an instance store, so the extra disk would go unused. Wiring that up is a separate change.No tests:
misc/scratch/*.jsonare launch configs consumed bybin/scratch, with no test coverage.Release notes
None. Developer tooling only.
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