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Bug
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Resolution: Unresolved
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Major
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None
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CNV v4.12.0, CNV v4.14.0, CNV v4.15.0, CNV v4.16.0, CNV v4.17.0, CNV v4.18.0
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None
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0.42
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False
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False
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Green
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None
Description of problem:
When creating 100s of DV clones using ODF w/ the default csi-cloning method, clone performance can stall considerably, potentially taking many hours to complete. This is due to some flattening limitations in ODF and it is strongly recommend to use a VolumeSnapshot cloning method for this type of scale. Virt docs should clearly state this recommendation when using ODF.
Suggested draft text (has been reviewed by CNV & ODF Eng): https://docs.google.com/document/d/1_I5ayeVHtvP5Has1dpdGNkpPOUESZL0Gb-IfSi6O8sE/edit
Virt Docs do briefly touch on VolumeSnapshots but it should be made into a much stronger recommendation when using ODF specifically: https://docs.openshift.com/container-platform/4.16/virt/virtual_machines/creating_vms_custom/virt-creating-vms-by-cloning-pvcs.html#virt-cloning-pvc-to-dv-cli_virt-creating-vms-by-cloning-pvcs
Version-Release number of selected component (if applicable):
All supported 4.x
How reproducible:
Issues w/ default csi-clone observed many times for >100 clones
latest scale bug reference:
https://issues.redhat.com/browse/CNV-41845
Once the docs clearly state this ODF limitation & recommendation, the related known issue can be removed: https://issues.redhat.com/browse/CNV-23501
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