As per RFE 2035334, this BZ is tracking the implementation of preallocated disks for the control plane nodes and the intially created worker nodes. This implementation exposes 3 options in the install config. (See https://docs.openshift.com/container-platform/4.9/installing/installing_rhv/installing-rhv-customizations.html for details.) - clone: creates virtual machines that are cloned from the template instead of linking it to the original. (Default so far was: false) - sparse: creates a thin-provisioned disk. (Default so far was: true) - format: lets users switch disk formats. Can be "raw" or "cow". Raw disks don't support backups, but may be better for sparse provisioning on the underlying storage system. (Default so far was: "cow") Suggestion for default values in this BZ is welcome. Default values will only be applied to newly created install configs. When using an install config from a previous OCP version the old default values will still be applied. Note: The installer creates the control plane nodes with the given settings and the initial machine set for worker nodes. The control plane node configuration cannot be changed after installation at this time. The machine set for worker nodes can be updated and worker nodes can be replaced after the installation for preallocated worker nodes. This change is dependent on the Terraform provider supporting these flags, which is not tracked in Bugzilla: https://github.com/oVirt/terraform-provider-ovirt/pull/313
Verified by testing these three configurations: Configuration 1 This installation should be performed without modifications to the install config. The flags on the control plane nodes should be: cloned sparse provisioned QCOW2 format Configuration 2 In this configuration we preallocate disks and the following configuration should be used. controlPlane: platform: ovirt: clone: true sparse: false format: raw compute: platform: ovirt: clone: true sparse: false format: raw Configuration 3 controlPlane: platform: ovirt: clone: false sparse: true format: cow compute: platform: ovirt: clone: false sparse: true format: cow OCP version: 4.11.0-0.nightly-2022-05-18-053037 Platform: RHV 4.5.0.6-0.7.el8ev IPI Steps: Configuration 1: 1. Created new install-config using Openshift installer. 2. Ran Openshift installation using unmodified install-config 3. Verified relevant flags on control plane and worker nodes as follows: Masters: - Disk format Expected: cow Actual: cow - Sparseness Expected: true (thin provision) Actual: true (thin provision) - Cloned from the template Expected: true (Clone/Independent) Actual: true (Clone/Independent) Workers: - Disk format Expected: cow Actual: cow - Sparseness Expected: true (thin provision) Actual: true (thin provision) - Cloned from the template Expected: true (Clone/Independent) Actual: true (Clone/Independent) Configuration 2: 1. Modified install-config as outlined above. 2. Ran Openshift installation using modified install-config 3. Verified relevant flags on control plane and worker nodes as follows: Masters: - Disk format Expected: raw Actual: raw - Sparseness Expected: false (preallocated) Actual: false (preallocated) - Cloned from the template Expected: true (Clone/Independent) Actual: true (Clone/Independent) Workers: - Disk format Expected: raw Actual: raw - Sparseness Expected: false (preallocated) Actual: false (preallocated) - Cloned from the template Expected: true (Clone/Independent) Actual: true (Clone/Independent) Configuration 3: 1. Modified install-config as outlined above. 2. Ran Openshift installation using modified install-config 3. Verified relevant flags on control plane and worker nodes as follows: Masters: - Disk format Expected: cow Actual: cow - Sparseness Expected: true (thin provision) Actual: true (thin provision) - Cloned from the template Expected: false (Thin/Dependent) Actual: false (Thin/Dependent) Workers: - Disk format Expected: cow Actual: cow - Sparseness Expected: true (thin provision) Actual: true (thin provision) - Cloned from the template Expected: false (Thin/Dependent) Actual: false (Thin/Dependent)
Documentation - new PR https://github.com/openshift/openshift-docs/pull/47085
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory (Important: OpenShift Container Platform 4.11.0 bug fix and security update), and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHSA-2022:5069