Use Esxcli commands to obtain information about vSAN and to troubleshoot your vSAN environment.

The following commands are available:
Command Description
esxcli vsan network list Verify which VMkernel adapters are used for vSAN communication.
esxcli vsan storage list List storage disks claimed by vSAN.
esxcli vsan cluster get Get vSAN cluster information.
esxcli vsan health Get vSAN cluster health status.
esxcli vsan debug Get vSAN cluster debug information.

The esxcli vsan debug commands can help you debug and troubleshoot the vSAN cluster, especially when vCenter Server is not available.

Use: esxcli vsan debug {cmd} [cmd options]

Debug commands:
Command Description
esxcli vsan debug disk Debug vSAN physical disks.
esxcli vsan debug object Debug vSAN objects.
esxcli vsan debug resync Debug vSAN resyncing objects.
esxcli vsan debug controller Debug vSAN disk controllers.
esxcli vsan debug limit Debug vSAN limits.
esxcli vsan debug vmdk Debug vSAN VMDKs.
Example esxcli vsan debug commands: 
esxcli vsan debug disk summary get
   Overall Health: green
   Component Metadata Health: green
   Memory Pools (heaps): green
   Memory Pools (slabs): green
esxcli vsan debug disk list
UUID: 52e1d1fa-af0e-0c6c-f219-e5e1d224b469
   Name: mpx.vmhba1:C0:T1:L0
   SSD: False
   Overall Health: green
   Congestion Health:
         State: green
         Congestion Value: 0
         Congestion Area: none
   In Cmmds: true
   In Vsi: true
   Metadata Health: green
   Operational Health: green
   Space Health:
         State: green
         Capacity: 107365793792 bytes
         Used: 1434451968 bytes
         Reserved: 150994944 bytes
esxcli vsan debug object health summary get
    Health Status                                     Number Of Objects
    ------------------------------------------------  -----------------
    reduced-availability-with-no-rebuild-delay-timer                  0
    reduced-availability-with-active-rebuild                          0
    inaccessible                                                      0
    data-move                                                         0
    healthy                                                           1
    nonavailability-related-incompliance                              0
    nonavailability-related-reconfig                                  0
    reduced-availability-with-no-rebuild                              0
esxcli vsan debug object list
    Object UUID: 47cbdc58-e01c-9e33-dada-020010d5dfa3
       Version: 5
       Health: healthy
       Owner:
       Policy:
          stripeWidth: 1
          CSN: 1
          spbmProfileName: vSAN Default Storage Policy
          spbmProfileId: aa6d5a82-1c88-45da-85d3-3d74b91a5bad
          forceProvisioning: 0
          cacheReservation: 0
          proportionalCapacity: [0, 100]
          spbmProfileGenerationNumber: 0
          hostFailuresToTolerate: 1

       Configuration:
          RAID_1
             Component: 47cbdc58-6928-333f-0c51-020010d5dfa3
               Component State: ACTIVE,  Address Space(B): 273804165120 (255.00GB),  
               Disk UUID: 52e95956-42cf-4d30-9cbe-763c616614d5, Disk Name: mpx.vmhba1..
               Votes: 1,  Capacity Used(B): 373293056 (0.35GB), 
               Physical Capacity Used(B): 369098752 (0.34GB),  Host Name: sc-rdops...
             Component: 47cbdc58-eebf-363f-cf2b-020010d5dfa3
               Component State: ACTIVE,  Address Space(B): 273804165120 (255.00GB),  
               Disk UUID: 52d11301-1720-9901-eb0a-157d68b3e4fc,  Disk Name: mpx.vmh...
               Votes: 1,  Capacity Used(B): 373293056 (0.35GB),  
               Physical Capacity Used(B): 369098752 (0.34GB),  Host Name: sc-rdops-vm..
          Witness: 47cbdc58-21d2-383f-e45a-020010d5dfa3
            Component State: ACTIVE,  Address Space(B): 0 (0.00GB),  
            Disk UUID: 52bfd405-160b-96ba-cf42-09da8c2d7023,  Disk Name: mpx.vmh...
            Votes: 1,  Capacity Used(B): 12582912 (0.01GB),  
            Physical Capacity Used(B): 4194304 (0.00GB),  Host Name: sc-rdops-vm...
    
       Type: vmnamespace
       Path: /vmfs/volumes/vsan:52134fafd48ad6d6-bf03cb6af0f21b8d/New Virtual Machine
       Group UUID: 00000000-0000-0000-0000-000000000000
       Directory Name: New Virtual Machine
esxcli vsan debug controller list
    Device Name: vmhba1
       Device Display Name: LSI Logic/Symbios Logic 53c1030 PCI-X Fusion-MPT Dual Ult..
       Used By VSAN: true
       PCI ID: 1000/0030/15ad/1976
       Driver Name: mptspi
       Driver Version: 4.23.01.00-10vmw
       Max Supported Queue Depth: 127
esxcli vsan debug limit get
       Component Limit Health: green
       Max Components: 750
       Free Components: 748
       Disk Free Space Health: green
       Lowest Free Disk Space: 99 %
       Used Disk Space: 1807745024 bytes
       Used Disk Space (GB): 1.68 GB
       Total Disk Space: 107365793792 bytes
       Total Disk Space (GB): 99.99 GB
       Read Cache Free Reservation Health: green
       Reserved Read Cache Size: 0 bytes
       Reserved Read Cache Size (GB): 0.00 GB
       Total Read Cache Size: 0 bytes
       Total Read Cache Size (GB): 0.00 GB
esxcli vsan debug vmdk list
    Object: 50cbdc58-506f-c4c2-0bde-020010d5dfa3
       Health: healthy
       Type: vdisk
       Path: /vmfs/volumes/vsan:52134fafd48ad6d6-bf03cb6af0f21b8d/47cbdc58-e01c-9e33-
             dada-020010d5dfa3/New Virtual Machine.vmdk
       Directory Name: N/A
esxcli vsan debug resync list
   Object            Component              Bytes Left To Resync  GB Left To Resync
   ----------------  ---------------------  --------------------  -----------------
   31cfdc58-e68d...  Component:23d1dc58...             536870912  0.50
   31cfdc58-e68d...  Component:23d1dc58...            1073741824  1.00
   31cfdc58-e68d...  Component:23d1dc58...            1073741824  1.00