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 How the NFS driver works

The NFS driver, and other drivers based on it, work quite differently than a traditional block storage driver.

The NFS driver does not actually allow an instance to access a storage device at the block level. Instead, files are created on an NFS share and mapped to instances, which emulates a block device. This works in a similar way to QEMU, which stores instances in the /var/lib/nova/instances directory.

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