DISK OPERATION ERROR in AIX

Last month, we noted errpt showing an error:

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[root@aix:/] errpt -a
IDENTIFIER TIMESTAMP  T C RESOURCE_NAME  DESCRIPTION
DCB47997   1122091816 T H hdisk29        DISK OPERATION ERROR
F31FFAC3   1122091816 I H hdisk29        PATH HAS RECOVERED
DE3B8540   1122091816 P H hdisk29        PATH HAS FAILED
DCB47997   1122075216 T H hdisk26        DISK OPERATION ERROR
F31FFAC3   1122075216 I H hdisk26        PATH HAS RECOVERED
DE3B8540   1122075216 P H hdisk26        PATH HAS FAILED
DCB47997   1122070516 T H hdisk31        DISK OPERATION ERROR
F31FFAC3   1122070516 I H hdisk31        PATH HAS RECOVERED
DE3B8540   1122070516 P H hdisk31        PATH HAS FAILED

A way to find what’s causing this error is using ‘lsmpio’ command to display detailed device statistics for the hdisks devices.
NOTE: lsmpio command was introduce in AIX 7.1 TL3 and 6.1 TL9.

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[root@aix:/] lsmpio -Sdl hdisk29
Disk: hdisk29
    Path statistics since Fri Dec 09 12:56:32 CET 2016
    Path 0: (fscsi0:500a09829af63ecf,7000000000000)
        Path Selections:                              1282755
        Adapter Errors:                                     0
            Software:                        0
            Hardware:                        0
            Transport Dead:                  0
            Transport Busy:                  0
            Transport Fault:                 0
            No Device Response:              0
            Target Port ID Changed:          0
        Command Timeouts:                                   0
        Reservation Conflicts:                              0
        SCSI Queue Full:                                    0
        SCSI Busy:                                          0
        SCSI ACA Active:                                    0
        SCSI Task Aborted:                                  0
        SCSI Aborted Command:                               0
        SCSI Check Condition:                               0
            Medium Error:                    0
            Hardware Error:                  0
            Not Ready:                       0
            Other:                           0
        Last Error:                                       N/A
        Last Error Time:                                  N/A
        Path Failure Count:                                 0
            Due to Adapter Error:            0
            Due to I/O Error:                0
            Due to Health Check:             0
            Due to SCSI Sense:               0
            Due to Qualifier Bit:            0
            Due to Opening Error:            0
        Last Path Failure:                                N/A
        Last Path Failure Time:                           N/A
Disk: hdisk29
    Path statistics since Fri Dec 09 12:56:31 CET 2016
    Path 1: (fscsi1:500a09828af63ecf,7000000000000)
        Path Selections:                              1254441
        Adapter Errors:                                     3
            Software:                        0
            Hardware:                        0
            Transport Dead:                  0
            Transport Busy:                  0
            Transport Fault:                 0
            No Device Response:              0
            Target Port ID Changed:          0
        Command Timeouts:                                   3
        Reservation Conflicts:                              0
        SCSI Queue Full:                                    0
        SCSI Busy:                                          0
        SCSI ACA Active:                                    0
        SCSI Task Aborted:                                  0
        SCSI Aborted Command:                               0
        SCSI Check Condition:                               0
            Medium Error:                    0
            Hardware Error:                  0
            Not Ready:                       0
            Other:                           0
        Last Error:                                  SCSI Command Timeout
        Last Error Time:                             Mon Dec 12 09:12:08 CET 2016
        Path Failure Count:                                 0
            Due to Adapter Error:            0
            Due to I/O Error:                0
            Due to Health Check:             0
            Due to SCSI Sense:               0
            Due to Qualifier Bit:            0
            Due to Opening Error:            0
        Last Path Failure:                                N/A
        Last Path Failure Time:                           N/A

As you can see in the output, the cause of the issue is “SCSI Command Timeout” on FC adapter.
Please, check FC network (VIOS, NPIV, SAN zonning).

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