Updating an old system image with yum results in hitting up hordes of mirrors for drpms that have aged-off, I guess? Update succeeds, but after 20 minutes of "FAILURE" scrolling across the screen. Yum should give up trying to find drpms sooner, and just get actual rpms to speed up the update process.
Yum-presto has been merged into yum for Fedora 19, so this functionality should be implemented in yum. FWIW, if yum can't find a drpm on a mirror, it's likely that it won't find the rpm either. Do you happen to have the output from yum available?
This is not drpm specific. Yum always tries *all* mirrors, and (after a recent change) in case yum.conf:retries > #mirrors some mirrors are tried more than once. I've thought of changing the behavior that we always make exactly yum.conf:retries attempts and skip remaining mirrors. That should help in the common case that we have retries=10 and say 100 or so mirrors. It'd be a simple change, but I'm not sure it's always better than current behavior.
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