VPLEX: Distributed device hierarchy is missing extent

           

   Article Number:     540392                                   Article Version: 2     Article Type:    Break Fix 
   

 


Product:

 

VPLEX for All Flash,VPLEX GeoSynchrony,VPLEX Local,VPLEX Metro,VPLEX Series,VPLEX VS2,VPLEX VS6,VPLEX GeoSynchrony 5.5 Patch 1,VPLEX GeoSynchrony 5.5 Service Pack 1,VPLEX GeoSynchrony 5.5 Service Pack 1 Patch 1

 

Issue:

 

 

When viewing the component hierarchy for a distributed device, a device leg is missing an extent.   
   
    VPlexcli:/> show-use-hierarchy distributed-storage/distributed-devices/device_CLARiiON1234_LUN_00030_1     
      storage-view: Windows (cluster-1)     
        consistency-group: CG-CS-Test (synchronous)     
          virtual-volume: device_CLARiiON1234_LUN_00030_1_vol (1G, distributed @ cluster-1, running)     
            distributed-device: device_CLARiiON1234_LUN_00030_1 (1G, raid-1)     
              distributed-device-component: device_C2_CLARiiON1234_LUN_00015_1 (1G, raid-0, cluster-2)     
                extent: extent_C2_CLARiiON1234_LUN_00015_1 (1G)     
                  storage-volume: C2_CLARiiON1234_LUN_00015 (1G)     
                    logical-unit: VPD83T3:60060160xxxxxxxx56343574ffa5e811     
                      storage-array: EMC-CLARiiON-APM00xxxxxxxxx     
              distributed-device-component: extent_CLARiiON1234_LUN_00030_1 (1G, cluster-1)
   
                                                                                                                                                <-- The missing extent is expected here.   
              storage-volume: CLARiiON1234_LUN_00030 (1G)   
                logical-unit: VPD83T3:60060160xxxxxxxx815405d2daae811     
                    storage-array: EMC-CLARiiON-APM00xxxxxxxxx
   
   
   
    When the distributed device components are listed, one appears as an extent with a geometry of "slice".   
   
    VPlexcli:/> ll /distributed-storage/distributed-devices/device_CLARiiON1234_LUN_00030_1/distributed-device-components/     
     
      /distributed-storage/distributed-devices/device_CLARiiON1234_LUN_00030_1/distributed-device-components:     
      Name                                Cluster    Child  Fully   Operational  Health  Block   Block  Capacity  Geometry  Total     
      ----------------------------------  ---------  Slot   Logged  Status       State   Count   Size   --------  --------  FreeSpace     
      ----------------------------------  ---------  -----  ------  -----------  ------  ------  -----  --------  --------  ---------     
      device_C2_CLARiiON1234_LUN_00015_1  cluster-2  1      true    ok           ok      262144  4K     1G        raid-0    -     
      extent_CLARiiON1234_LUN_00030_1     cluster-1  0      true    ok           ok      262144  4K     1G        slice     - <-- N
ote the "Geometry" for this extent is listed as 'slice'.   
     
                                                           

 

 

Cause:

 

 

This issue may occur as a result of a extent migration on the volume, under rare circumstances. After the migration is complete, an R0 (RAID 0) device is missing on top of the extent in the component hierarchy.                                                           

 

 

Resolution:

 

 

The missing R0 device in the component hierarchy is a cosmetic issue. There will not be any noticeable impact on VPLEX operations from leaving the device in this state. However, if a resolution of this cosmetic issue is desired, please open a Service Request with VPLEX support and mention this article.    
   
    The resolution for this display issue is to use internal firmware commands to insert a new R0 device on top of the extent. This process will not cause any impact but should only be completed by technical support.   
   
    Permanent Fix:   
    As this is a cosmetic issue there is no permanent fix at this time.