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

Solution Verified - Updated -

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 eqaul to 1 which could lead to missing sd devices as per Why scsi device name not created for all paths of LUN?

$ less sg_inq_out |grep -A 4 "Device /dev/sg119"
---- Device /dev/sg119 ----
standard INQUIRY:
  PQual=0  Device_type=0  RMB=0  version=0x06  [SPC-4]

$ less sg_inq_out |grep -A 4 "Device /dev/sg120"
---- Device /dev/sg120 ----
standard INQUIRY:
  PQual=0  Device_type=0  RMB=0  version=0x06  [SPC-4]

$ less sg_inq_out |grep -A 4 "Device /dev/sg121"
---- Device /dev/sg121 ----
standard INQUIRY:
  PQual=0  Device_type=0  RMB=0  version=0x06  [SPC-4]

Environment

  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7

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