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VSAN disk components are marked ABSENT after enabling CBT (2077611)

Symptoms

  • VSAN disk components are marked ABSENT after enabling CBT (Changed Block Tracking) on a virtual machine that has existing snapshots.
  • vSphere Web Client reports these errors:

    • An error was received from the ESX host while powering on Virtual Machine
    • Failed to start the virtual machine
    • Module DiskEarly power on failed
    • Cannot open the disk disk path or one of the snapshot disks it depends on
    • Input/output error

  • In the var/log/vmkernel log file, you see entries similar to:

    CBT: 2214: Created device 2e5979a-cbt for cbt driver with filehandle 48600986
    WARNING: CBT: 2039: Unsupported ioctl 60
    WARNING: CBT: 2039: Unsupported ioctl 59
    WARNING: VSAN: VsanIoctlCtrlNode:1746: 1d936753-620a-f2e0-7c5c-c81f66ceb509: RPC to DOM returned: No connection

    Note: 1d936753-620a-f2e0-7c5c-c81f66ceb509 in the preceeding log is the DOM_OBJECT UUID.

  • Running the vsan.vm_object_info command on the virtual machine that cannot start in Ruby vSphere Console (RVC) reports entries similar to:

    Disk backing: [vsanDatastore] 845a3153-a9bd-1d2a-e0f5-c81f66ceb509/filename-000002.vmdk
    DOM Object: 2b936753-1db8-1d8e-b65c-c81f66ceb509 (owner: test.acme.fqdn, policy: hostFailuresToTolerate = 0, stripeWidth = 2, proportionalCapacity = [0, 100])
    Witness: 2b936753-47c5-5fa8-fc90-c81f66ceb509 (state: ACTIVE (5), host: test.acme.fqdn, md: naa.50000c0f0225b88c, ssd: naa.5001e820026efc2c)
    RAID_0
    Component: 2b936753-af9a-5ea8-c8d7-c81f66ceb509 (state: ACTIVE (5), host: test.acme.fqdn, md: naa.50000c0f0225d8e0, ssd: naa.5001e820026efc2c)
    Component: 2b936753-591d-5da8-99e5-c81f66ceb509 (state: ACTIVE (5), host: test.acme.fqdn, md: naa.50000c0f0225b88c, ssd: naa.5001e820026efc2c)
    Disk backing: [vsanDatastore] 845a3153-a9bd-1d2a-e0f5-c81f66ceb509/filename.vmdk
    DOM Object: 1d936753-620a-f2e0-7c5c-c81f66ceb509 (owner: test.acme.fqdn, policy: hostFailuresToTolerate = 0, stripeWidth = 2, proportionalCapacity = 100)
    Witness: 1d936753-e41d-40e3-b305-c81f66ceb509 (state: ACTIVE (5), host: test.acme.fqdn, md: naa.50000c0f0225b88c, ssd: naa.5001e820026efc2c)
    RAID_0
    Component: 1d936753-416b-3fe3-45a6-c81f66ceb509 (state: ABSENT (6)
    , host: test.acme.fqdn, md: naa.50000c0f0225d8e0, ssd: naa.5001e820026efc2c)
    Component: 1d936753-ef55-3ee3-bbea-c81f66ceb509 (state: ACTIVE (5), host: test.acme.fqdn, md: naa.50000c0f0225b88c, ssd: naa.5001e820026efc2c)

    Note: 1d936753-620a-f2e0-7c5c-c81f66ceb509 is the component of the object which is in state 6 (ABSENT).

Resolution

This issue is resolved in VMware ESXi 5.5 Update 2, available on VMware Downloads. For more information, see VMware ESXi 5.5 Update 2 Release Notes.

To work around this issue if you cannot upgrade, run this command in Ruby vSphere Console (RVC):

vsan.check_state --refresh-state /localhost/ACME/computers/vSAN-Kit1/

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