deletion support about cephgeorep

[joshuaboud]

Due to the way cephgeorep works, tacking the --delete flag to the execution arguments won't work as expected, and will delete everything not in the current batch it's syncing. You are correct that a periodic full rsync with --delete is needed. I believe there is some combination of rsync flags that will only delete remote files without resending any existing ones, but I can't remember off the top of my head what they are. Definitely use --dry-run first and let us know which flags work for you, as this would be good information for the README.