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ONTAP SAN after Windows reboot LUN disappears

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ontap-9
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san
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Applies to

  • ONTAP 9.14 and later
  • SnapMirror

Issue

  • LUN disappeared after LUN move and release of the base Snapshot for the Snapmirror Consistency Group
  • SCSI disk entries are moved to hidden state when MPIO is configured 
  • Microsoft MPIO shows Event ID 47 after a LUN migration and device name displays Disk -1 for all the target ports:
MPIO disk -1.png
 
  • New target-port-groups IDs are created with a higher order (i.e 13e9 comes before the original 13e8) and the report_new_rtpgids flag is set to 1
cluster2::*> debug san lun show-target-port-groups
Vserver Node                 Path  Target Port Groups
------- -------------------- ----- ------------------------------------------
svm1_cluster2                /vol/NetApp/NetApp
<snip>
                             /vol/vol_sql1_db_dest/sql1_db
        cluster2-01                13e9 Active/Non-Optimized: 2
                                   13e8 Active/Optimized: 1
        cluster2-02                13e9 Active/Non-Optimized: 2
                                   13e8 Active/Optimized: 1

cluster2::*> statistics show -object lun -counter scsit_lu_flag_status -node cluster2-01 -raw

Object: lun
Instance: /vol/vol_sql1_db_dest/sql1_db
Start-time: 1/8/2025 14:02:33
End-time: 1/8/2025 14:02:33
Scope: svm1_cluster2
Number of Constituents: 1 (complete_aggregation)
    Counter                                                     Value
    -------------------------------- --------------------------------
    scsit_lu_flag_status                                            -
                         lu_readonly                                0
                  report_new_rtpgids                                1

 

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