If you upgrade to Data ONTAP 7.3.1 with support for the SnapLock logging feature, you will have access to new configurable options and commands required for this feature.
If you revert to a release that does not support the SnapLock logging feature, all the active SnapLock log files will be archived. The SnapLock log file is committed to the WORM state and acts as a simple WORM file. You will lose all the state information about the active log file, for example, the sequence number. The SnapLock log files that already exist are protected against any modification and deletion. All the existing WORM files will be retained until the expiry date of the file.