Need help to understand Ceph OSD Encryption

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Hi,

I am looking at the code of ceph-volume. When it's in lvm mode, it will
encrypt the device during the preparation stage and decrypt the device
during activation stage
<https://github.dev/ceph/ceph/blob/0d4786e0af7f9407034c5d261cd0d3b1eafa25c6/src/ceph-volume/ceph_volume/devices/lvm/activate.py#L175-L177>.
However, if it's in raw mode, it will only do encryption during the
preparation stage but won't do decryption during the activation process.
Then where will the decryption be done? And why is it designed to be
different from the lvm mode?

Thanks!
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