lpfc reports "BLKGRD: lpfc_scsi_prep_dma_buf_s4: Too many sg segments from dma_map_sg. Config 64, seg_cnt 11" and I/O is interrupted in RHEL 6 or 7

Solution Verified - Updated -

Issue

  • lpfc driver reports an error message references "Too many sg segments" and I/O is interrupted
kernel: lpfc 0000:08:00.3: 1:9074 BLKGRD: lpfc_scsi_prep_dma_buf_s4: Too many sg segments from dma_map_sg.  Config 64, seg_cnt 112
  • We are experiencing storage I/O disruptions when there are multiple adapters from different vendors on the same host
  • During IO on FCoE devices , the emulex driver reports error messages and IO hangs

Environment

  • Red Hat Enterprise Linux (RHEL) 6 or 7
  • lfpc loaded with an Emulex storage adapter
  • One or more additional storage adapters from another vendor
  • Storage devices from multiple adapters aggregated using device-mapper-multipath or another multi-path solution

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