Standard sync, optimized for speed by bypassing any unneeded steps.
Sync even if the upstream metadata appears to have no change. This option is only relevant for yum repositories and will take longer than an optimized sync. Choose this option if:
One or more RPMs are not showing up in the local repository even though they exist in the upstream repository.
Performs a complete sync, verifying the checksum of all packages afterwards. Any missing or corrupt package will be re-downloaded. This option will take the longest amount of time. Choose this option if:
Specific packages are throwing a 404 from the package-manager.
Packages are corrupt, often leading to an error "Package does not match intended download" or "Hash Sum mismatch".
When validating content, repositories using the "On Demand" download policy will download all packages within the repository.