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CONTAP-693287: Slower S3 PUT performance when using a single stream

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ontap-9
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cloud
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Issue

Customer observes low single-stream S3 upload performance to the ONTAP S3 server on Amazon FSx for NetApp ONTAP.
  • Single TCP connection PutObject throughput limited to ~75–170 MB/s
  • Seen even when using large EC2 instances with high available network bandwidth (for example, 50–100 Gbps)
  • No obvious client-side CPU or network saturation during the upload

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