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Multipath Issues on host due to increasing CRC errors on ethernet ports

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ontap-9
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san
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Applies to

  • AFF
  • Ontap 9.x
  • ISCSI
  • RHCOS(RedHat CoreOS)
  • Openshift\Trident

Issue

  • Fewer iSCSI paths are observed on the host than expected, leading to I/O errors, failed or pending multipath status, and inability to create pods on worker nodes.
  • The issue is intermittent, with multipath -ll occasionally displaying “I/O pending” or “failed” across multiple nodes.
  • Below events are seen on host end.

[Fri Dec 19 19:28:12 2025] sd 3:0:0:1: Power-on or device reset occurred
[Fri Dec 19 19:28:12 2025]  connection17:0: ping timeout of 5 secs expired, recv timeout 5, last rx 4301139922, last ping 4301145088, now 4301150208
[Fri Dec 19 19:28:12 2025]  connection17:0: detected conn error (1022)
[Fri Dec 19 19:28:12 2025] sd 2:0:0:1: [sdb] tag#67 FAILED Result: hostbyte=DID_TRANSPORT_DISRUPTED driverbyte=DRIVER_OK cmd_age=12s
[Fri Dec 19 19:28:12 2025] sd 2:0:0:1: [sdb] tag#66 FAILED Result: hostbyte=DID_TRANSPORT_DISRUPTED driverbyte=DRIVER_OK cmd_age=71s
[Fri Dec 19 19:28:49 2025] device-mapper: multipath: 253:1: Failing path 8:64.
[Fri Dec 19 19:28:51 2025] device-mapper: multipath: 253:1: Failing path 8:48.

  • LIFs used for iSCSI connections are up and functioning normally.
  • However, the underlying Ethernet ports show CRC errors when running the ifstat command. 
  • These CRCs appear on the receive side.
  • Statistics were cleared to rule out historical data, but CRC counts continued to increase after clearing.

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