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Intermittent S3 multipart upload operations fail

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Category:
ontap-9
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nas
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Applies to

  • ONTAP 9
  • S3
  • Multipart Upload Operations
  • Quality Of Service (QOS)
  • Flexgroup
  • Performance

Issue

  • Intermittent S3 multipart upload operations fail with client-side errors such as:

Put "https://10.1.1.251/zone2/zoneinformation/data": context deadline exceeded

  • Additional symptoms:
    • S3 clients see timeouts when writing to storage 
      • Debugged SKTRACE.log shows the connection is closed by the by the client after waiting too long:

S3_CMD_Err:  n0x1556a3: [1] Connection closed by client: Remote 10.1.1.100:44144 <-> Local 10.1.1.251:443

    • Most multipart PUTs succeed
    • QOS is enabled on the storage 
      • High QoS throttling and latency observed in ONTAP performance archives during workload bursts (up to 1.1GB/s & 20 IOPS)
    • The FlexGroup volume is configured with only one constituent

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