20 lines
1.0 KiB
YAML
20 lines
1.0 KiB
YAML
---
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other:
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Nova now has a config option called
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``[workarounds]/never_download_image_if_on_rbd`` which helps to
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avoid pathological storage behavior with multiple ceph clusters.
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Currently, Nova does *not* support multiple ceph clusters
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properly, but Glance can be configured with them. If an instance
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is booted from an image residing in a ceph cluster other than the
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one Nova knows about, it will silently download it from Glance and
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re-upload the image to the local ceph privately for that
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instance. Unlike the behavior you expect when configuring Nova and
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Glance for ceph, Nova will continue to do this over and over for
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the same image when subsequent instances are booted, consuming a
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large amount of storage unexpectedly. The new workaround option
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will cause Nova to refuse to do this download/upload behavior and
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instead fail the instance boot. It is simply a stop-gap effort to
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allow unsupported deployments with multiple ceph clusters from
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silently consuming large amounts of disk space.
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