12.2. Configuring live migration

Prerequisites

• You have installed the OpenShift CLI (oc).

Procedure

• Edit the HyperConverged CR and add the necessary live migration parameters:

  $ oc edit hyperconverged kubevirt-hyperconverged -n openshift-cnv

  Example configuration file:

  apiVersion: hco.kubevirt.io/v1beta1
  kind: HyperConverged
  metadata:
    name: kubevirt-hyperconverged
    namespace: openshift-cnv
  spec:
    liveMigrationConfig:
      bandwidthPerMigration: 64Mi
      completionTimeoutPerGiB: 800
      parallelMigrationsPerCluster: 5
      parallelOutboundMigrationsPerNode: 2
      progressTimeout: 150
      allowPostCopy: false

  where:

  bandwidthPerMigration

  Specifies the bandwidth of each migration in bytes per second. For example, a value of 2048Mi means 2048 MiB/s. Default: 0, which is unlimited.

  completionTimeoutPerGiB

  Specifies the length of time, in seconds per GiB of memory, at which the migration is canceled if it has not completed. For example, a VM with 6GiB memory times out if it has not completed migration in 4800 seconds. If the Migration Method is BlockMigration, the size of the migrating disks is included in the calculation.

  parallelMigrationsPerCluster

  Specifies the number of migrations running in parallel in the cluster. Default: 5.

  parallelOutboundMigrationsPerNode

  Specifies the maximum number of outbound migrations per node. Default: 2.

  progressTimeout

  Specifies the length of time, in seconds, at which the migration is canceled if memory copy fails to make progress. Default: 150.

  allowPostCopy

  Specifies whether the post copy mode is enabled. You can enable post copy mode to allow the migration of one node to another to converge, even if a VM is running a heavy workload and the memory dirty rate is too high. By default, allowPostCopy is set to false.

  참고

  You can restore the default value for any spec.liveMigrationConfig field by deleting that key/value pair and saving the file. For example, delete progressTimeout: <value> to restore the default progressTimeout: 150.