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vNIOS for KVM supports most of the features of the Infoblox NIOS appliances, with the following limitations:

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• If the vNIOS instance fails to launch, the ports created for the instance are not deleted automatically. You need to delete them manually.
• When you start an FTP connection on OpenStack with the Listen on port field set to 2021, you need to manually add a rule to allow the 2021 port. This ensures that the connection is successful.
• Connection to the FTP service might fail when the virtual appliance enter the passive mode. To avoid this, do the following:
  • Use active mode instead of passive mode.
  • Modify the vnios-sec-group security group to open ports 1023 and above.
  • Use the FTP client inside the internal network.
• The vNIOS instances deployed in the OpenStack environment do not support HSM Safenet groups.
• IPv6 support in the OpenStack environment is limited by the Juno release and has not been verified by Infoblox.
• You cannot configure the reporting virtual appliance as an HA pair. You also cannot configure it as a Grid Master or Grid Master Candidate. You can use it only as a dedicated reporting server in the Grid.
• At certain times, a power  power failure (or an unexpected reboot) of the VM host may cause a corruption of the VM guest corruption unless writes are correctly persisted.   To do this, you must have an NVRAM-based disk controller on the host system and turn-off disk caching for the guest on the VM host. That is, you must set the value of the disk_cachemodes parameter to the  writethrough value. The  The method to set the the disk_cachemodes parameter varies for different hypervisors. 
  
  • The following example pertains to vNIOS
  for KVM
  • for KVM deployed in OpenStack 16.2
  . 
  • :
    Log

    1. Sign in to the system as a root user.

    2. Edit

    the edit

    1. the nova.conf

    and nova-cpu.conf

    1. files by running

    the vim

    1. the following commands:
       vi /var/lib/config-data/puppet-generated/nova/etc/nova/nova.conf

    and vim

    1. 
       vi /var/lib/config-data/puppet-generated/nova_libvirt/etc/nova/nova

    -cpu

    1. .conf

    commands.
    1. Go to the [libvirt] section in both the files.

    2. 1. On a new line,

       add 

       1. add:
          disk_cachemodes = file=

       "writethrough".Restart the nova services.

       1. writethrough,block=writeback,network=writeback

       2. Save the changes and restart all containers related to Nova using the command:
          podman restart container_id

    3. The following example pertains to vNIOS
  for KVM Hypervisor through the KVM Manager:
  
  • In KVM virt-manager, select writethrough from the disk cachemode drop-down list when deploying the instance.
  • Validate the instance by editing the guest XML file and updating for KVM Hypervisor:
    1. Set the cache mode to writethrough by passing the cache=writethrough parameter in the virt-install command:
    2. Validate this setting in the instance by editing the guest XML file as follows:
       Configure the cache mode by updating the cache parameter inside the driver
     tag
    1.  tag to specify a caching
    option to configure the cache mode.
    1. option.
       
       For example, to set
    the
    1. the cache
    parameter to
    1.  parameter to writethrough: 
       <disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='writethrough'/>
<source file='/home/vms/mygm.qcow2' index='1'/>
<backingStore/>
<target dev='vda' bus='virtio'/>
<alias name='virtio-disk0'/>
><address type='pci' domain='0x0000' bus='0x07' slot='0x00' function='0x0'/>
</disk>