Hello,
I'm configuring a nested self hosted engine environment with 4.2.7 and CentOS 7.5.
Domain type is NFS.
I deployed with

hosted-engine --deploy --noansible

All went apparently good but after creating the master storage domain I see that the hosted engine domain is not automatically imported
At the moment I have only one host.

ovirt-ha-agent status gives every 10 seconds:
Nov 09 00:36:30 ovirtdemo01.localdomain.local ovirt-ha-agent[18407]: ovirt-ha-agent ovirt_hosted_engine_ha.agent.hosted_engine.HostedEngine.config.vm ERROR Unable to identify the OVF_STORE volume, falling back to initial vm.conf. Please ensure you already added your first data domain for regular VMs

In engine.log I see  every 15 seconds a dumpxml output ad the message:

2018-11-09 00:31:52,822+01 WARN  [org.ovirt.engine.core.vdsbroker.vdsbroker.VdsBrokerObjectsBuilder] (EE-ManagedThreadFactory-engineScheduled-Thread-52) [7fcce3cb] null architecture type, replacing with x86_64, VM [HostedEngine]

see full below.

Any hint?

Thanks
Gianluca

2018-11-09 00:31:52,714+01 INFO  [org.ovirt.engine.core.vdsbroker.monitoring.VmAnalyzer] (EE-ManagedThreadFactory-engineScheduled-Thread-52) [] VM '21c5fe9f-cd46-49fd-a6f3-009b4d450894' was discovered as 'Up' on VDS '4de40432-c1f7-4f20-b231-347095015fbd'(ovirtdemo01.localdomain.local)
2018-11-09 00:31:52,764+01 INFO  [org.ovirt.engine.core.bll.AddUnmanagedVmsCommand] (EE-ManagedThreadFactory-engineScheduled-Thread-52) [7fcce3cb] Running command: AddUnmanagedVmsCommand internal: true.
2018-11-09 00:31:52,766+01 INFO  [org.ovirt.engine.core.vdsbroker.vdsbroker.DumpXmlsVDSCommand] (EE-ManagedThreadFactory-engineScheduled-Thread-52) [7fcce3cb] START, DumpXmlsVDSCommand(HostName = ovirtdemo01.localdomain.local, Params:{hostId='4de40432-c1f7-4f20-b231-347095015fbd', vmIds='[21c5fe9f-cd46-49fd-a6f3-009b4d450894]'}), log id: 5d5a0a63
2018-11-09 00:31:52,775+01 INFO  [org.ovirt.engine.core.vdsbroker.vdsbroker.DumpXmlsVDSCommand] (EE-ManagedThreadFactory-engineScheduled-Thread-52) [7fcce3cb] FINISH, DumpXmlsVDSCommand, return: {21c5fe9f-cd46-49fd-a6f3-009b4d450894=<domain type='kvm' id='2'>
  <name>HostedEngine</name>
  <uuid>21c5fe9f-cd46-49fd-a6f3-009b4d450894</uuid>
  <metadata xmlns:ovirt-tune="http://ovirt.org/vm/tune/1.0" xmlns:ovirt-vm="http://ovirt.org/vm/1.0">
    <ovirt-tune:qos/>
    <ovirt-vm:vm xmlns:ovirt-vm="http://ovirt.org/vm/1.0">
    <ovirt-vm:destroy_on_reboot type="bool">False</ovirt-vm:destroy_on_reboot>
    <ovirt-vm:memGuaranteedSize type="int">0</ovirt-vm:memGuaranteedSize>
    <ovirt-vm:startTime type="float">1541719799.6</ovirt-vm:startTime>
    <ovirt-vm:device devtype="console" name="console0">
        <ovirt-vm:deviceId>2e8944d3-7ac4-4597-8883-c0b2937fb23b</ovirt-vm:deviceId>
        <ovirt-vm:specParams/>
        <ovirt-vm:vm_custom/>
    </ovirt-vm:device>
    <ovirt-vm:device mac_address="00:16:3e:35:d9:2c">
        <ovirt-vm:deviceId>0f1d0ce3-8843-4418-b882-0d84ca481717</ovirt-vm:deviceId>
        <ovirt-vm:network>ovirtmgmt</ovirt-vm:network>
        <ovirt-vm:specParams/>
        <ovirt-vm:vm_custom/>
    </ovirt-vm:device>
    <ovirt-vm:device devtype="disk" name="hdc">
        <ovirt-vm:deviceId>6d167005-b547-4190-938f-ce1b82eae7af</ovirt-vm:deviceId>
        <ovirt-vm:shared>false</ovirt-vm:shared>
        <ovirt-vm:specParams/>
        <ovirt-vm:vm_custom/>
    </ovirt-vm:device>
    <ovirt-vm:device devtype="disk" name="vda">
        <ovirt-vm:deviceId>8eb98007-1d9a-4689-bbab-b3c7060efef8</ovirt-vm:deviceId>
        <ovirt-vm:domainID>fbcfb922-0103-43fb-a2b6-2bf0c9e356ea</ovirt-vm:domainID>
        <ovirt-vm:guestName>/dev/vda</ovirt-vm:guestName>
        <ovirt-vm:imageID>8eb98007-1d9a-4689-bbab-b3c7060efef8</ovirt-vm:imageID>
        <ovirt-vm:poolID>00000000-0000-0000-0000-000000000000</ovirt-vm:poolID>
        <ovirt-vm:shared>exclusive</ovirt-vm:shared>
        <ovirt-vm:volumeID>64bdb7cd-60a1-4420-b3a6-607b20e2cd5a</ovirt-vm:volumeID>
        <ovirt-vm:specParams/>
        <ovirt-vm:vm_custom/>
        <ovirt-vm:volumeChain>
            <ovirt-vm:volumeChainNode>
                <ovirt-vm:domainID>fbcfb922-0103-43fb-a2b6-2bf0c9e356ea</ovirt-vm:domainID>
                <ovirt-vm:imageID>8eb98007-1d9a-4689-bbab-b3c7060efef8</ovirt-vm:imageID>
                <ovirt-vm:leaseOffset type="int">0</ovirt-vm:leaseOffset>
                <ovirt-vm:leasePath>/rhev/data-center/mnt/ovirtdemo01.localdomain.local:_SHE__DOMAIN/fbcfb922-0103-43fb-a2b6-2bf0c9e356ea/images/8eb98007-1d9a-4689-bbab-b3c7060efef8/64bdb7cd-60a1-4420-b3a6-607b20e2cd5a.lease</ovirt-vm:leasePath>
                <ovirt-vm:path>/rhev/data-center/mnt/ovirtdemo01.localdomain.local:_SHE__DOMAIN/fbcfb922-0103-43fb-a2b6-2bf0c9e356ea/images/8eb98007-1d9a-4689-bbab-b3c7060efef8/64bdb7cd-60a1-4420-b3a6-607b20e2cd5a</ovirt-vm:path>
                <ovirt-vm:volumeID>64bdb7cd-60a1-4420-b3a6-607b20e2cd5a</ovirt-vm:volumeID>
            </ovirt-vm:volumeChainNode>
        </ovirt-vm:volumeChain>
    </ovirt-vm:device>
</ovirt-vm:vm>
  </metadata>
  <memory unit='KiB'>6270976</memory>
  <currentMemory unit='KiB'>6270976</currentMemory>
  <vcpu placement='static' current='1'>2</vcpu>
  <cputune>
    <shares>1020</shares>
  </cputune>
  <resource>
    <partition>/machine</partition>
  </resource>
  <sysinfo type='smbios'>
    <system>
      <entry name='manufacturer'>oVirt</entry>
      <entry name='product'>oVirt Node</entry>
      <entry name='version'>7-5.1804.5.el7.centos</entry>
      <entry name='serial'>2820BD92-2B2B-42C5-912B-76FB65E93FBF</entry>
      <entry name='uuid'>21c5fe9f-cd46-49fd-a6f3-009b4d450894</entry>
    </system>
  </sysinfo>
  <os>
    <type arch='x86_64' machine='pc-i440fx-rhel7.5.0'>hvm</type>
    <smbios mode='sysinfo'/>
  </os>
  <features>
    <acpi/>
  </features>
  <cpu mode='custom' match='exact' check='full'>
    <model fallback='forbid'>Skylake-Client</model>
    <feature policy='require' name='hypervisor'/>
  </cpu>
  <clock offset='variable' adjustment='0' basis='utc'>
    <timer name='rtc' tickpolicy='catchup'/>
    <timer name='pit' tickpolicy='delay'/>
    <timer name='hpet' present='no'/>
  </clock>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>destroy</on_reboot>
  <on_crash>destroy</on_crash>
  <devices>
    <emulator>/usr/libexec/qemu-kvm</emulator>
    <disk type='file' device='cdrom'>
      <driver error_policy='stop'/>
      <source startupPolicy='optional'/>
      <target dev='hdc' bus='ide'/>
      <readonly/>
      <alias name='ide0-1-0'/>
      <address type='drive' controller='0' bus='1' target='0' unit='0'/>
    </disk>
    <disk type='file' device='disk' snapshot='no'>
      <driver name='qemu' type='raw' cache='none' error_policy='stop' io='threads'/>
      <source file='/var/run/vdsm/storage/fbcfb922-0103-43fb-a2b6-2bf0c9e356ea/8eb98007-1d9a-4689-bbab-b3c7060efef8/64bdb7cd-60a1-4420-b3a6-607b20e2cd5a'/>
      <backingStore/>
      <target dev='vda' bus='virtio'/>
      <serial>8eb98007-1d9a-4689-bbab-b3c7060efef8</serial>
      <boot order='1'/>
      <alias name='virtio-disk0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
    </disk>
    <controller type='scsi' index='0' model='virtio-scsi'>
      <alias name='scsi0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
    </controller>
    <controller type='usb' index='0' model='piix3-uhci'>
      <alias name='usb'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
    </controller>
    <controller type='pci' index='0' model='pci-root'>
      <alias name='pci.0'/>
    </controller>
    <controller type='ide' index='0'>
      <alias name='ide'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
    </controller>
    <controller type='virtio-serial' index='0'>
      <alias name='virtio-serial0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
    </controller>
    <lease>
      <lockspace>fbcfb922-0103-43fb-a2b6-2bf0c9e356ea</lockspace>
      <key>64bdb7cd-60a1-4420-b3a6-607b20e2cd5a</key>
      <target path='/rhev/data-center/mnt/ovirtdemo01.localdomain.local:_SHE__DOMAIN/fbcfb922-0103-43fb-a2b6-2bf0c9e356ea/images/8eb98007-1d9a-4689-bbab-b3c7060efef8/64bdb7cd-60a1-4420-b3a6-607b20e2cd5a.lease'/>
    </lease>
    <interface type='bridge'>
      <mac address='00:16:3e:35:d9:2c'/>
      <source bridge='ovirtmgmt'/>
      <target dev='vnet0'/>
      <model type='virtio'/>
      <link state='up'/>
      <alias name='net0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
    </interface>
    <console type='pty' tty='/dev/pts/0'>
      <source path='/dev/pts/0'/>
      <target type='virtio' port='0'/>
      <alias name='console0'/>
    </console>
    <channel type='unix'>
      <source mode='bind' path='/var/lib/libvirt/qemu/channels/21c5fe9f-cd46-49fd-a6f3-009b4d450894.com.redhat.rhevm.vdsm'/>
      <target type='virtio' name='com.redhat.rhevm.vdsm' state='connected'/>
      <alias name='channel0'/>
      <address type='virtio-serial' controller='0' bus='0' port='1'/>
    </channel>
    <channel type='unix'>
      <source mode='bind' path='/var/lib/libvirt/qemu/channels/21c5fe9f-cd46-49fd-a6f3-009b4d450894.org.qemu.guest_agent.0'/>
      <target type='virtio' name='org.qemu.guest_agent.0' state='connected'/>
      <alias name='channel1'/>
      <address type='virtio-serial' controller='0' bus='0' port='2'/>
    </channel>
    <channel type='unix'>
      <source mode='bind' path='/var/lib/libvirt/qemu/channels/21c5fe9f-cd46-49fd-a6f3-009b4d450894.org.ovirt.hosted-engine-setup.0'/>
      <target type='virtio' name='org.ovirt.hosted-engine-setup.0' state='disconnected'/>
      <alias name='channel2'/>
      <address type='virtio-serial' controller='0' bus='0' port='3'/>
    </channel>
    <input type='mouse' bus='ps2'>
      <alias name='input0'/>
    </input>
    <input type='keyboard' bus='ps2'>
      <alias name='input1'/>
    </input>
    <graphics type='vnc' port='5900' autoport='yes' listen='0' passwdValidTo='1970-01-01T00:00:01'>
      <listen type='address' address='0'/>
    </graphics>
    <video>
      <model type='vga' vram='32768' heads='1' primary='yes'/>
      <alias name='video0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </video>
    <memballoon model='none'>
      <alias name='balloon0'/>
    </memballoon>
    <rng model='virtio'>
      <backend model='random'>/dev/urandom</backend>
      <alias name='rng0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
    </rng>
  </devices>
  <seclabel type='dynamic' model='selinux' relabel='yes'>
    <label>system_u:system_r:svirt_t:s0:c500,c542</label>
    <imagelabel>system_u:object_r:svirt_image_t:s0:c500,c542</imagelabel>
  </seclabel>
  <seclabel type='dynamic' model='dac' relabel='yes'>
    <label>+107:+107</label>
    <imagelabel>+107:+107</imagelabel>
  </seclabel>
</domain>
}, log id: 5d5a0a63
2018-11-09 00:31:52,822+01 WARN  [org.ovirt.engine.core.vdsbroker.vdsbroker.VdsBrokerObjectsBuilder] (EE-ManagedThreadFactory-engineScheduled-Thread-52) [7fcce3cb] null architecture type, replacing with x86_64, VM [HostedEngine]