VxRail: Platform Service Failed With Error 'assert len(boot_devs) == 1, 'We have multiple boot devices'

VxRail Platform service failed with error assert len(boot_devs) == 1, 'We have multiple boot devices? reported in the platform_svc.log

VxVerfy is showing error '2 Fail | 536795 | bmc: Firmware test timeout. Check Platform Service'.

Platform_svc.log is showing issues with executing script located at path /opt/vxrail/bin/utility/host.py line 443.

Line 443 in the host.py script is responsible for doing the checks on the bootable devices on the ESXi as shown below:

def get_service_datastore_path():
    """get the service datastore path

    This is a guess work. The assumption is that we will have one and only one VMFS ds on
    the boot device.
    """
    boot_devs = {
        dev['Device'] for dev in esxcli('storage core device list')
            if dev['Is Boot Device']
    }
    assert len(boot_devs) == 1, 'We have multiple boot devices?'
    dev = boot_devs.pop()
    with HostConnection() as host_conn:
        ds = host_conn.get_vmfs_datastore_on_bootdev(dev)
        if ds:
            return ds[0].info.url
    return None 

When you run esxcli storage core device list | grep -i dellboss -A40, the DELLBOSS_VD is not set as a boot device as shown below, which causes the script to crash.

[management@esxi03:~] esxcli storage core device list | grep -i dellboss -A40
t10.ATA_____DELLBOSS_VD_____________________________d2f1e897dd2e001000000000
   Display Name: Local ATA Disk (t10.ATA_____DELLBOSS_VD_____________________________d2f1e897dd2e001000000000)
   Has Settable Display Name: true
   Size: 228872
   Device Type: Direct-Access
   Multipath Plugin: NMP
   Devfs Path: /vmfs/devices/disks/t10.ATA_____DELLBOSS_VD_____________________________d2f1e897dd2e001000000000
   Vendor: ATA
   Model: DELLBOSS VD
   Revision: 00-0
   SCSI Level: 5
   Is Pseudo: false
   Status: on
   Is RDM Capable: false
   Is Local: true
   Is Removable: false
   Is SSD: false
   Is VVOL PE: false
   Is Offline: false
   Is Perennially Reserved: false
   Queue Full Sample Size: 0
   Queue Full Threshold: 0
   Thin Provisioning Status: yes
   Attached Filters:
   VAAI Status: unsupported
   Other UIDs: vml.0100000000643266316538393764643265303031300000000044454c4c424f
   Is Shared Clusterwide: false
   Is SAS: false
   Is USB: false
   Is Boot Device: false
   Device Max Queue Depth: 31
   No of outstanding IOs with competing worlds: 31
   Drive Type: unknown
   RAID Level: unknown
   Number of Physical Drives: unknown
   Protection Enabled: false
   PI Activated: false
   PI Type: 0
   PI Protection Mask: NO PROTECTION
   Supported Guard Types: NO GUARD SUPPORT
   DIX Enabled: false
   DIX Guard Type: NO GUARD SUPPORT
   Emulated DIX/DIF Enabled: false

To resolve this issue: 

1. Place the server in maintenance mode. 
2. Reboot the server.
3. Confirm Is Boot Device : true using the command:

   esxcli storage core device list | grep -i dellboss -A40

If rebooting the node does not fix the issue, power drain the node following: PowerEdge: How Do I Reset and Power Drain or Do a Virtual AC Cycle