Private VLAN throughput reduced between GPU nodes in Singapore (SIN1)

Affected:

GPU nodes · SIN1

Duration

57 min

Reference

inc-20250823-1

Timeline

1. Resolved23 Aug 2025, 19:22 UTC

   Resolved. Transceiver replaced; monitoring now alerts on single-uplink operation.

2. Monitoring23 Aug 2025, 19:06 UTC

   Both uplinks are up and throughput is back to 25 Gbps.

3. Identified23 Aug 2025, 18:39 UTC

   A leaf switch is running with one of two uplinks down. The link is being replaced.

4. Investigating23 Aug 2025, 18:25 UTC

   Node-to-node bandwidth on the GPU VLAN in Singapore (SIN1) is below the 25 Gbps target.

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