Key Considerations

During a cold restore, ON–Bar performs the following validations to rename chunks:

1. It validates that the old chunk pathnames and offsets exist in the archive reserved pages.
2. It validates that the new chunk pathnames and offsets do not overlap each other or existing chunks.
3. If renaming the primary root or mirror root chunk, it updates the ONCONFIG file parameters ROOTPATH and ROOTOFFSET, or MIRRORPATH, and MIRROROFFSET. The old version of the ONCONFIG file is saved as $ONCONFIG.localtime.
4. It restores the data from the old chunks to the new chunks (if the new chunks exist).
5. It writes the rename information for each chunk to the online log.

If either of the validation steps fail, the renaming process stops and ON–Bar writes an error message to the ON–Bar activity log.