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Bug 1946898

Summary:	[OSP-17] Document deprecation of 'i440fx' machine type in OSP-17; and migration path to 'q35'
Product:	Red Hat OpenStack	Reporter:	Kashyap Chamarthy <kchamart>
Component:	documentation	Assignee:	Joanne O'Flynn <joflynn>
Status:	CLOSED CURRENTRELEASE	QA Contact:	RHOS Documentation Team <rhos-docs>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	17.1 (Wallaby)	CC:	alifshit, gregraka, igallagh, jmitterm, mariel, smooney
Target Milestone:	z3	Keywords:	FutureFeature, Reopened, Triaged
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	Deprecated Functionality
Doc Text:	The i440FX PC machine type `pc-i440fx` was deprecated in RHEL 8. While the `pc-i440fx-*` machine types are still available, Red Hat recommends that you use the default Q35 machine type in RHOSP 17.1. Some RHOSP 17.1 features do not work with the i440FX PC machine type. For example, the VirtIO Block (`virtio-blk`) device does not work with the i440FX PC machine type in RHOSP 17.1. To use VirtIO Block as the block device for instances in RHOSP 17.1, your instances must use the Q35 machine type.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2024-11-18 12:18:23 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1946956, 1946961, 1946978
Bug Blocks:	1581414

Description Kashyap Chamarthy 2021-04-07 08:09:35 UTC

The 'i440fx' QEMU machine type and its alias 'pc' are deprecated in
RHEL-9.  Since OSP-17 is based on RHEL-9; we need to document this
deprecation for OSP customers.

This means all machine types starting with 'pc-i440fx' (and the
generic alias, 'pc') are deprecated:

    $> /usr/libexec/qemu-kvm -machine help | grep  pc-i440fx
    pc                   RHEL 7.6.0 PC (i440FX + PIIX, 1996) (alias of pc-i440fx-rhel7.6.0)
    pc-i440fx-rhel7.6.0  RHEL 7.6.0 PC (i440FX + PIIX, 1996) (default)
    pc-i440fx-rhel7.5.0  RHEL 7.5.0 PC (i440FX + PIIX, 1996)
    pc-i440fx-rhel7.4.0  RHEL 7.4.0 PC (i440FX + PIIX, 1996)
    pc-i440fx-rhel7.3.0  RHEL 7.3.0 PC (i440FX + PIIX, 1996)
    pc-i440fx-rhel7.2.0  RHEL 7.2.0 PC (i440FX + PIIX, 1996)
    pc-i440fx-rhel7.1.0  RHEL 7.1.0 PC (i440FX + PIIX, 1996)
    pc-i440fx-rhel7.0.0  RHEL 7.0.0 PC (i440FX + PIIX, 1996)

Note that OSP's current default machine type is: 'pc-i440fx-rhel7.6.0'.

So we also need to document a path to migrate from 'pc-i440fx-rhel7.6.0' 
to 'q35' machine type in OSP-17.
~

Comment 6 Artom Lifshitz 2022-07-28 19:49:05 UTC

@mariel I think we (the devs) would like to keep this open for tracking/awareness. If we're confident that the RHOSPDOC Jira is enough, and that once the 16 -> 17.1 FFU guide is closer to being done we won't forget to integrate this into it, then yes, we can close this BZ.

Comment 10 Irina 2023-04-18 14:26:03 UTC

Deprecation release note added to the Release notes on the Customer Portal:

https://access.redhat.com/documentation/en-us/red_hat_openstack_platform/17.0/html-single/release_notes/index#deprecated_functionality

Comment 16 Joanne O'Flynn 2024-11-18 12:18:23 UTC

Issue: https://issues.redhat.com/browse/OSP-1899

Comment 17 Red Hat Bugzilla 2025-03-19 04:25:02 UTC

The needinfo request[s] on this closed bug have been removed as they have been unresolved for 120 days