Bugfix: Instances listed under maxVolumeLimits not taking into account ENIs/Instance storage
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…t ENIs/Instance storage Signed-off-by: Eddie Torres <torredil@amazon.com>
Signed-off-by: Eddie Torres <torredil@amazon.com>
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Is this a bug fix or adding new feature?
Bugfix
closes #1688
What is this PR about? / Why do we need it?
This PR addresses a bug in the driver where the calculation that subtracts ENIs and Instance store values is bypassed for certain instance types. More specifically, instance types included in
maxVolumeLimits: https://github.com/kubernetes-sigs/aws-ebs-csi-driver/blob/v1.21.0/pkg/cloud/volume_limits.go#L56-66.As an example,
d3.8xlarge(nitro instance) reports a value of3: https://github.com/kubernetes-sigs/aws-ebs-csi-driver/blob/6f2db761cfa352e05483b7f360b4ed9053b382d6/pkg/cloud/volume_limits.go#L57C3-L57C13 even when several ENIs are attached.Following the current logic,
availableAttachmentsis equal to the default value ofnitroMaxAttachments=28when enis and instance store volumes are taken into account. Finally, taking the min ofmaxVolumeLimitsandavailableAttachments, the value is incorrectly set to 3.With this change,
availableAttachmentsis set tomaxVolumeLimitsif necessary before the calculation is performed so that enis and instance store volumes can be correctly taken into account.What testing is done?
make test