Les clusters de l'environnement NSX-v s'affichent sur la page Migrer les hôtes. Les clusters sont organisés en groupes de migration, chaque groupe de migration contenant un cluster d'hôtes vSphere. Plusieurs paramètres contrôlent la migration de l'hôte.

  • Click Settings to change the global settings: Pause Between Groups and Migration Order Across Groups.
  • Select a single host group (cluster) and use the arrows to move it up or down in the migration sequence.
  • Select one or more host groups (clusters) and click Actions to change these host groups settings: Migration Order Within Groups, Migration State, and Migration Mode.

Pause Between Groups

Pause Between Groups is a global setting that applies to all host groups. If pausing is enabled, the migration coordinator migrates one host group, and then waits for input. You must click Continue to continue to the next host group.

By default, Pause Between Groups is disabled. If you want to verify the status of the applications running on each cluster before proceeding to the next one, enable Pause Between Groups.

Serial or Parallel Migration Order

You can define whether migration happens in a serial or parallel order. There are two ordering settings:
  • Migration Order Across Groups is a global setting that applies to all host groups.

    • Serial: One host group (cluster) at a time is migrated.
    • Parallel: Up to five host groups at a time are migrated. After those five host groups are migrated, the next batch of up to five host groups are migrated.
      Important :

      If you are migrating from NSX-v 6.4.4, 6.4.5, or 6.4.6, and your environment uses vSphere Distributed Switch 7.0, do not select parallel migration order across groups.

      If you are migrating from NSX-v 6.4.8 or later, and your environment uses vSphere Distributed Switch 7.0, parallel migration order across groups is supported.

  • Migration Order Within Groups is a host group (cluster) specific setting, so can be configured separately on each host group.

    • Serial: One host within the host group (cluster) at a time is migrated.
    • Parallel: Up to five hosts within the host group are migrated at a time. After those hosts are migrated, the next batch of up to five hosts are migrated.
      Important : Do not select parallel migration order within groups for a cluster if you plan to use Maintenance migration mode for that cluster.

By default, both settings are set to Serial. Together, the settings determine how many hosts are migrated at a time.

Tableau 1. Effects of Migration Settings on Number of Hosts Attempting Migration Simultaneously
Migration Order Across Groups (Clusters) Migration Order Within Groups (Clusters) Maximum Number of Hosts Attempting Migration Simultaneously
Serial Serial 1

One host from one host group

Serial Parallel 5

Five hosts from one host group

Parallel Serial 5

One host from five host groups

Parallel Parallel 25

Five hosts from five host groups

Important :

If there is a failure to migrate a host, the migration process will pause after all in-progress host migrations have finished. If Parallel is selected for both migration across groups and migration within groups, there might be a long outage for the failed host before you can retry migration.

Sequence of Migration Groups

You can select a host group (cluster) and use the arrows to move it up or down in the list of groups.

Si la migration d'un hôte échoue, vous pouvez déplacer son groupe d'hôtes en bas de la liste des groupes. La migration d'autres groupes d'hôtes peut continuer pendant que vous résolvez le problème de l'hôte posant problème.

Migration State

Host groups (clusters) can have one of two migration states:

  • Enabled

    Hosts groups with a migration state of Enabled are migrated to NSX-T when you click Start on the Migrate Hosts page.

  • Disabled

    You can temporarily exclude host groups from migration by setting the migration state for the groups to Disabled. Hosts in disabled groups are not migrated to NSX-T when you click Start on the Migrate Hosts page. However, you must enable and migrate all Disabled host groups before you can click Finish. Finish all host migration tasks and click Finish within the same maintenance window.

In the Resolve Configuration step, the migration coordinator identifies the hosts that are ineligible for migration. In the Migrate Hosts step, these hosts are assigned the migration state of Do not migrate. For example, hosts that do not have NSX-v installed have the Do not migrate status.

Migration Mode

Migration Mode is a host group (cluster) specific setting, and can be configured separately on each host group. In the Migrate Hosts step, you select whether to use In-Place or Maintenance mode.

There are two types of Maintenance migration modes:
  • Automated
  • Manual
In the Resolve Configuration step of the migration process, you select which type of Maintenance migration mode to use. You select a Maintenance mode even if you plan to migrate hosts using In-Place mode. When you select Maintenance migration mode in the Migrate Hosts step, the value you specified in the Resolve Configuration step determines whether Automated Maintenance mode or Manual Maintenance mode is used. However, in the Migrate Hosts step, if you select In-Place mode, your selected choice of Maintenance mode in the Resolve Configuration step does not take effect.

Le mode de migration Sur place n'est pas pris en charge si votre installation de NSX-v utilise vSphere Distributed Switch 7.0.

Si votre environnement utilise le pare-feu distribué, sélectionnez le mode de migration Maintenance automatisée. Si vous sélectionnez un autre mode de migration, les limitations suivantes s'appliquent aux environnements avec pare-feu distribué :

  • Si vous utilisez le mode de migration Maintenance manuelle, toutes les machines virtuelles doivent être déplacées vers les hôtes NSX-T, connectées à des segments NSX-T et mises sous tension avant que le dernier hôte NSX-v commence la migration. Lorsque vous migrez votre dernier hôte NSX-v, ne mettez pas les machines virtuelles hors tension sur l'hôte. Transférez-les vers un hôte NSX-T à l'aide de vMotion.
  • Si vous utilisez le mode de migration Maintenance manuelle, les machines virtuelles disposent d'un espace dans la protection par pare-feu pendant 5 minutes après leur transfert vers un hôte NSX-T.
  • Si vous utilisez le mode de migration Sur place et que vous avez des règles de pare-feu distribué qui sont appliquées à une machine virtuelle, ces règles ne sont pas poussées vers l'hôte tant que l'hôte et toutes ses machines virtuelles n'ont pas migré. Jusqu'à ce que les règles soient poussées vers l'hôte, les points suivants s'appliquent :
    • Si la règle NSX-T par défaut est deny, la machine virtuelle n'est pas accessible.
    • Si la règle NSX-T par défaut est accept, la machine virtuelle n'est pas protégée par les règles Appliqué à.
Chaque mode de migration comporte un processus différent :
  • In-Place migration mode

    NSX-T is installed and NSX components are migrated while VMs are running on the hosts. Hosts are not put in maintenance mode during migration. Virtual machines experience a short network outage and network storage I/O outage during the migration.

  • Automated Maintenance migration mode

    A task of entering maintenance mode is automatically queued. VMs are moved to other hosts using vMotion. Depending on availability and capacity, VMs are migrated to NSX-v or NSX-T hosts. After the host is evacuated, the host enters maintenance mode, NSX-T is installed, and NSX components are migrated. VMs are migrated back to the newly configured NSX-T host. Note that Migration Coordinator will not reconfigure VMs that are powered off. After migration, you need to manually configure these VMs before powering them on.

  • Manual Maintenance migration mode

    A task of entering maintenance mode is automatically queued. To allow the host to enter maintenance mode, do one of the following tasks:
    • Power off all VMs on the hosts.
    • Move the VMs to another host using vMotion or cold migration.

    Once the host is in maintenance mode, NSX-T is installed on the host and NSX components are migrated. Note that the powered-off VMs and their network configurations are not migrated. You will need to manually connect the VMs to their NSX-T segments.