we're syncing our internal mirror against mirrors.se.kernel.org, and noticed that there have been some fluctuations on the packages there. Sometimes the timestamp file indicates "Mon May 2 14:48:01 UTC 2011". So files are synced, deleted and then resynced.
...
I'm not seeing anything obvious (and digging back through the logs will take a while). Are you still seeing this problem, is this something I should tear through the logs to try and find something?
I can dig out the specifics from the logs to verify if you like, but this is probably related to the issue reported by Svetozar Mihailov the other day, mirrors.ch-center.com (centose5 of msync.centos.org) is out of date:
http://mirrors.ch-center.com/timestamp.txt
// J