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You can and should configure block device timeout on nova-compute.

In novative.conf on compute:

block_device_allocate_retries=600
block_device_allocate_retries_interval=1

The above setting will force nova to wait up to 600 seconds checking every second.

The default retries is set to 180 I think. Set it higher if needed than 600 if you want to support larger images as they can take more time to copy.