全6のデータセンターが正常稼働中

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重大 解決済み レビュー公開済み

PDU fault in rack AMS-B06

電源・冷却 — AMS · アウトオブバンド管理 — AMS

タイムライン

  1. 解決済み

    Every machine in rack B06 has been up since 02:52 UTC. Duration: 16 minutes. The PDU is being replaced; the 8 machines that lost power receive the SLA extension automatically. Data on local disks is intact; the machines simply rebooted.

  2. 原因特定

    The A-side PDU in rack B06 failed with a breaker fault. The 8 machines that rebooted are the ones whose B-side supply was not seated correctly after a recent hardware change. All are powered from the B-side now and are booting.

  3. 調査中

    8 machines in rack B06 of AMS lost power at 02:36 UTC. Machines in the rack are dual-fed, but these 8 rebooted when one PDU failed. Engineers are at the rack.

事後レビュー ·

発生した事象と変更内容

原因

The A-side PDU in AMS-B06 suffered a breaker fault. Every machine in the rack has two power supplies on separate feeds, but on 8 of them the B-side cord had been left partially seated during a hardware change the previous week, so they lost power when the A side went.

影響度

8 machines rebooted and were unavailable for 16 minutes. No data was lost; the machines came back to the state they were installed in, with local disks intact.

変更内容

  • Every hardware change now ends with a power-redundancy test: each feed is dropped in turn and the machine must stay up.
  • The faulty PDU model is being phased out across the fleet.
  • Term extensions were applied to the 8 machines the same day.

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