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how to updae configdrive when updating metadata?

I want to use ConfigDrive instead of EC2 metadata service, that will help to boot the vm more quickly.

but a new problem is: if i use nova meta to update the metadata, i can access the new metadata by calling curl, but it doesnot change the configdrive in /dev/sr0

also, i have read the nova latest code, and found no code implement this. when i call nova meta <server-id> set key=value, it just update the database but doesn't update the disk.config

So, is there any other way to update the configdrive?