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Performance Regression with NetApp iSCSI LUNs on Ubuntu 24.04 and 26.04

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Category:
trident-kubernetes
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snapx
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Applies to

  • Ubuntu Linux 24.04, 26.04
  • iSCSI multipath environments
  • Kubernetes (tested with v1.32.8)
  • Trident 25.06

Issue

  • After upgrading from Ubuntu 22.04 (kernel 5.15) to Ubuntu 24.04/26.04 (kernels 6.8/7.0/7.1), disk I/O and bandwidth performance on NetApp LUNs accessed over iSCSI via Trident CSI is significantly lower. 
  • This occurs under identical hardware, network, and storage backend conditions.
  • Negotiated iSCSI session parameters from the command iscsiadm -m session -P 3:

MaxRecvDataSegmentLength: 262144
MaxXmitDataSegmentLength: 65536
FirstBurstLength: 65536
MaxBurstLength: 1048576
ImmediateData: Yes
InitialR2T: Yes
MaxOutstandingR2T: 1

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