'sd' devices are not created however 'sg' devices could be seen for external storage.

Issue

• sd devices are missing for some of the paths from external storage.

  [6:0:0:22]   disk    IBM      2145             0000  /dev/sdbt  /dev/sg82
  [6:0:0:23]   disk    IBM      2145             0000  /dev/sdbu  /dev/sg83
  - sd devices are missing for following paths from external storage
  [6:0:0:24]   disk    IBM      2145             0000  -         /dev/sg119
  [6:0:0:25]   disk    IBM      2145             0000  -         /dev/sg120
  [6:0:0:26]   disk    IBM      2145             0000  -         /dev/sg121
  

• PQual value is not equal to 1 which could lead to missing sd devices as per Why is a scsi device name not created for all paths of LUN?

  # sg_inq /dev/sg119
  standard INQUIRY:
    PQual=0  PDT=0  RMB=0  LU_CONG=0  hot_pluggable=0  version=0x06  [SPC-4]
  ...