I've checked this issue again.
With the latest master code, this function is really in use as follows:
nova/virt/block_device.py:226: volume_api.check_attach(context,
volume, instance=instance)
nova/compute/api.py:1022: # and depends on followed
volume_api.check_attach() to
nova/compute/api.py:1244:
self.volume_api.check_attach(context,
nova/compute/api.py:2989: self.volume_api.check_attach(context,
volume, instance=instance)
nova/compute/api.py:3064: self.volume_api.check_attach(context,
new_volume, instance=instance)
nova/compute/cells_api.py:424: self.volume_api.check_attach(context,
volume, instance=instance)
So, please remove this bug report!
** Changed in: nova
Status: Confirmed => Invalid
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https://bugs.launchpad.net/bugs/1392663
Title:
Un-used function check_attach() in module nova.volume.cinder
Status in OpenStack Compute (Nova):
Invalid
Bug description:
Version: stable/juno
The function check_attach() in module nova.volume.cinder is really un-used.
It's only used in Unit-Test.
In fact, if this function is really used in reality, then it will be
impossible to attach a volume to a VM instance in the case that the volume is
created in a different availability_zone than the VM instance.
However, in reality, for single-node deployment, if a new
availability_zone is created in Nova and thus the default
availability_zone of Nova is replaced, then Nova compute service will
be running in this newly-created availability_zone while Cinder
services are still running in the default availability_zone. It is
quite possible to attach a volume (created in the default
availability_zone) to a VM instance (created in the new
availability_zone)
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