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Bug
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Resolution: Done-Errata
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Undefined
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CNV v4.14.8, CNV v4.15.2
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None
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1
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False
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False
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CNV v4.16.1.rhel9-1
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---
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---
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CNV Infra 256
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Important
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No
Description of problem:
The rhel.9 cluster preference have preferredDiskDedicatedIoThread set to "true":
# oc get VirtualMachineClusterPreference rhel.9 -o yaml |yq '.spec.devices'
preferredDiskBus: virtio
preferredDiskDedicatedIoThread: true <===
preferredInterfaceModel: virtio
preferredRng: {}
It's not possible to add SCSI disk to the virtual machines using the above preference, because it will add "dedicatedIOThread: true" for all the disks and will fail with error below for SCSI disk:
Error "IOThreads are not supported for disks on a scsi bus" for field "spec.template.spec.domain.devices.disks.domain.devices.disks[1]".
In 4.14, where this Webhook rejection was not available (https://issues.redhat.com/browse/CNV-34292), it will allow to add the disk, but will fail during the VM startup:
oc get vm rhel-9-skilled-cod -o yaml |yq '.spec.preference,.spec.template.spec.domain'
kind: virtualmachineclusterpreference
name: rhel.9
revisionName: rhel-9-skilled-cod-rhel.9-0ab600fd-4a12-40ca-bd2b-a6065e9c830f-1
devices:
disks:
- disk:
bus: scsi
name: disk-pregnant-muskox
machine:
type: pc-q35-rhel9.2.0
resources: {}
oc get vmi rhel-9-skilled-cod -o yaml |yq '.spec.domain.devices.disks[0]' dedicatedIOThread: true disk: bus: scsi name: disk-pregnant-muskox
{"component":"virt-launcher","kind":"","level":"error","msg":"Failed to sync vmi","name":"rhel-9-skilled-cod","namespace":"nijin-cnv","pos":"server.go:202","reason":"virError(Code=67, Domain=10, Message='unsupported configuration: IOThreads not available for bus scsi target sda')","timestamp":"2024-06-05T15:36:11.954725Z","uid":"1f226cf1-ce5f-4e8a-8557-155bf4d6d7ed"}
Version-Release number of selected component (if applicable):
OpenShift Virtualization 4.15.2
How reproducible:
100%
Steps to Reproduce:
1. Create a VM from UI using instance and select rhel9 volume. 2. Once created, try to add a SCSI disk to the VM. It fails with error below: Error "IOThreads are not supported for disks on a scsi bus" for field "spec.template.spec.domain.devices.disks.domain.devices.disks[1]".
Actual results:
Cannot add Virtio-SCSI disks on VM having preference set to rhel.9 virtualmachineclusterpreference
Expected results:
dedicatedIOThread: true shouldn't be passed for SCSI disks
Additional info:
- links to
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RHEA-2024:136034
OpenShift Virtualization 4.16.1 Images
- mentioned on
